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    sS.xls Version 1.4 03/22/02

    [email protected]

    Johnson Graduate School of Management

    Cornell University

    Ithaca NY 14853

    This workbook is intended for teaching or research. You are welcome to use it in any manner,

    and change it as you see fit. It comes without any guarantee whatsoever, and is distributed

    free of charge. Changes are frequent, so check back f requently for a new version .

    Most inventory control systems use a formula for lead-time demand to set safety stock levels.

    Research has uncovered situations where that method leads to large and expensive errors.*

    In particular, if replenishment orders might not arrive in the same order in which they are placed, then

    the above method will leave you with too much inventory if your objective is a high level of protection,

    and too little inventory if you are aiming to run out of stock frequently. That is, the variance of the

    inventory level is smaller than the variance of lead-time demand.

    *See Robinson, L.R, J.R. Bradley and L.J. Thomas, "Consequences of Order Crossover underOrder-up-to Inventory Policies."M&SOM Manufacturing and Service Operations Management,

    Volume 3, No. 3 (2001), pp.175-188.

    This workbook contains a macro, written in Visual Basic, that allows you to simulate the inventory control

    system known variously as the Min-Max system, the (s,S) system, or the reorder-level, order-up-to system.

    Two versions are available in the simulation:

    > Periodic review: orders may be placed only at specific points of time, such as daily or weekly.

    > Continuous review: orders are placed instantly, as soon as inventory reaches the reorder level.

    In both cases, the state of the system is tracked at all times, so that accurate costs may be calculated.

    The word "order" refers to an action taken to replenish the supply of an item that is stocked in inventory

    and sold to customers. The word "demand" refers to a customer wanting to buy one unit of the item.

    A "backorder" is an unsatisfied demand for which the customer will take delivery at a later time.

    The simulation assumes that all customers are willing to wait if their demand is backordered.

    The simulation allows orders to cross. It assumes that the lead time of one order is independent of

    that for any other order, and therefore crossing occurs whenever the lead time for an order is longer

    than the interval between orders plus the lead time for the next order.

    Please note that the independence assumption is not true in some real circumstances. For example,

    if both orders are shipped by rail, and if one freight car cannot pass another, the orders cannot cross.However, in that case lead times are also not independent, but rather are positively correlated, so

    models that assume independence (i.e. most inventory models) are also incorrect.

    Simulating Inventory Control with Orders that Cross during Lead Time

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    Contents:These are the sheets in this workbook.

    Introduction (this sheet), with the following sections:

    where you set up the model and run the simulation.

    where simulation results are displayed in detail for any run stored on the Data sheet.

    where the first part of the most recent simulation run is shown in a table and a graph.

    where the results of all simulation runs are stored, until you erase them.

    Other sheets in this book, if any, may contain data and graphs from previous simulation experiments.

    1. Measuring Inventory and Shortages at Time of Delivery:

    sreorder level, or Min I nvOn-hand inventory

    Sorder-up-to level, or Max BONumber of units backordered to customers

    QS - s NetInv= Inv- BO (can be positive or negative)

    L A value of lead time I nvPositionNetInv + Outstanding Orders

    DA value of one-period demand DL Demand that occurs during lead timeL, VarL Average & Variance of L DL, VarDL Average & Variance of DLD, VarD Average & Variance of D

    (a) Shortfall below Reorder Level at Delivery: Shortfall@Deliv

    Protection against shortages focuses attention on inventory at the time a replenishment order

    arrives. Safety stock governs the likelihood that backorders will exist at that instant.

    In the simulation, @Deliv refers to events that happen just before replenishments occur.

    However, rather than tracking inventory, which can be positive or negative, the simulation monitors

    "Shortfall below sat delivery," defined as

    1) Shortfall@Deliv= s-NetI nv@Delivat the time (just before) replenishment occurs.

    This is a non-negative variable since net inventory is at or below the reorder level, s, whenever any

    order is outstanding (i.e. not yet received.)

    From Shortfall@Delivwe may compute certain performance measures:

    2) NetInv@Deliv = s- Shortfall@Deliv3) I nv@Deliv = MAX(0, s- Shortfall@Deliv)

    4) BO@Deliv= MAX(0, Shortfall@Deliv- s) = I nv@Deliv - s +Shortfall@Deliv

    5) P(BO@Deliv>0) = P( Shortfall@Deliv> s)

    The latter may also be expressed as a rate, although the meaning is a little confusing. It is NOT the

    rate at which backorders occur, but rather "occurrences per unit time" of the joint event

    "replenishment arrives, backorders exist," or "replenishment arrives too late to prevent backorders."

    That event is denoted "BO@Deliv>0" and its occurrence rate is

    6) Rate(BO@Deliv>0) = P( Shortfall@Deliv> s)(Replenishment Orders Per Uni t Time)

    Trace

    Data

    4. Optimization

    Simulate

    Graphs

    2. Inventory and Shortages at Any Time

    1. Measuring Inventory and Shortages at Time of Delivery

    3. Cost of Inventory, Backorders and Ordering:

    (a) Shortfall below Order-up-to Level

    (b) Distribution of Shortfall@Delivery if Orders do not Cross

    (a) Shortfall below Reorder Level at Delivery: Shortfall@Deliv

    (ii) Periodic Review

    (i) Continuous Review

    (b) Average Inventory and Shortages

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    (b) Distribution of Shortfall@Delivery if Orders do not Cross

    The following gives the classical argument for the distribution of shortfall, assuming that orders do

    not cross, and also assuming that lead times are independent, two assumptions which are convenient

    but contradictory. These numbers may be compared to the actual values from the simulation to see

    how much is lost if the classical rules are used.

    With no order crossing, when an order arrives, all prior replenishment orders have already arrived,

    and no subsequent ones have. At the time that order was placed, Inventory Position included the prior

    orders, so to compute inventory at delivery, we only have to account for the demand that occurs in the

    lead time (or lag time) between placing and receiving the order. That is,

    7) NetInv@Deliv= InvPosition@Ordering- DL and

    8) Shortfall@Deliv= s- I nvPosition@Orderi ng+ DL if orders do not cross (substitute 7 into 1).

    (i) Continuous Review

    Under continuous review, an order is placed the instant that inventory position reaches the reorder

    level. That is,

    9) I nvPosition@Orderi ng= sfor continuous review, so

    10) Shortfall@Deliv= DLfor continuous review if orders do not cross (substitute 9 into 8).

    >> Shortfall@Delivequals lead-time demand for continuous review, if orders do not cross.

    The probability that backorders occur before an order arrives is

    11) P(BO@Deliv>0) = P( DL> s) (substitute 10 into 5).

    The following formulas assume that Lead Times are independent and identically distributed, and that

    the same is true for Demands, and that Lead Times are independent of Demands. They are, in fact, the

    well-known formulas for the mean and variance of lead-time demand.

    12) E[Shortfall@Deliv] = mD mLand

    13) Var[Shortfall@Deliv] = mL VarD + mD2

    VarL for continuous review if orders do not cross.

    (ii) Periodic Review

    Under periodic review, inventory position can reach the reorder point at a time t that is before the end

    of the period, so inventory position will be at or below the reorder point when the order is placed.

    If t is at the end of the period, the order is placed at the instant that the reorder level is reached.

    If t is just after the beginning of the period, a one-period demand occurs before ordering.

    This leads to the following inequality:

    14) s - DI nvPosition@Orderi ngs

    Substituting 14 into 8,

    15) DLShortfall@DelivDL+ D = DL+1 for periodic review if orders do not cross.

    >> Shortfall@Delivis between the demand during lead time and the demand during one period longer

    than lead time, if orders do not cross. Also, because the probability above sis a nonincreasingfunction of s,

    16) P(DL> s) P(Shortfall@Deliv>s) P( DL+ D' - 1> s) , and so

    17) P(DL> s) P(BO@Deliv>0) P( DL+ D' - 1> s) (substitute 16 into 5).

    The expected value of 15 yields

    18) mDmLShortfall@DelivmD(1+mL)

    The arguments leading to equation 15 also yield a lower limit for the variance:

    19) Var[Shortfall@Deliv] mLVarD + mD2VarL

    The upper limit in equation 15 also yields a variance estimate, but it is not necessarily an upper limit:

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    20) Var[Shortfall@Deliv] (1 + mL) VarD + mD2VarL

    2. Inventory and Shortages at Any Time

    The simulation also measures the inventory level after every event. Inventory is constant between

    events (by definition, since an event is defined as a change of state), so the distribution is

    tabulated by accumulating the time that each state persists.

    (a) Shortfall below Order-up-to Level

    "Shortfall below S" is defined at every time in the simulation as

    20) Shortf all = S - NetI nv.

    Notice that Shortfalluses a different reference point than Shortfall@Delivery, namely Srather

    than s. This is necessary to avoid negative values.

    From Shortfall, we may compute more performance measures:

    21) NetI nv = S - Shortf all.

    22) I nv = MAX(0, S - Shortfall)

    23) BO= MAX(0, Shortfall - S) = I nv-S+Shortf all

    24) P(BO>0) = P( Shortfall> S)Since a demand is backordered if it arrives when inventory is zero, the average number of demands

    backordered per unit time is

    25) Rate(BO) = P( ShortfallS)(Demand Rate)

    We can also calculate the average time that a backorder endures which, according to Little's Law,

    is proportional to the average number of backorders waiting.

    Average duration of a Backorder = (Average # Backordered)(Rate of Backorders Occuring)

    26) Av(Wait per BO) = Av(BO){Av(DemandRate) P{ShortfallS)}

    If you want to include in this average the fact that many customers have zero backorder time, then

    27) Av(Wait per Demand) = Av(BO)Av(DemandRate) (includes zero-length backorders.)

    (b) Average Inventory and Shortages

    Average inventory is greater when computed over time than when computed just before a delivery.

    Inventory just before delivery can never be above the reorder point, whereas it can at other times.

    The average inventory over time will include the "sawtooth pattern" commonly seen in textbooks,

    caused by cycle stock represented by the order quantity. Therefore the exact theoretical expression

    for average inventory and backorders is elusive, and I will not try to include it here. However the

    simulation results yield averages from the distribution of Shortfall, using equations 22 through 25.

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    3. Cost of Inventory, Backorders and Ordering:

    The simplest model has linear inventory and backorder costs. However, what constitutes backorder

    cost? There may be a cost per unit time for backorders, and a fixed cost whenever a backorder

    occurs. There also might be a fixed cost per unit time that accrues as long as there are any

    backorders. If the gap between s and S is changed, the number of orders placed will change, which

    changes the cost of ordering. A model that covers all of these costs is

    28) Average Cost per Period = C1 Av(I nv) + C2 Av(BO) + C3 mD P(BO0)

    + C4 P(BO>0) + C5 Av(OrderRate)

    4. Optimization

    The value of Q(the gap between sand S) is held constant during a simulation. (In fact, it operates as

    if the order-up-to level were S=0 with reorder level s= -Q.) However, the output may be used

    to represent any (s,S) system that has S-s=Q. You can find the optimal value of samong all

    systems that have the same Qas the one in your simulation, and then set S=s+Q.

    On the Graphs sheet, an Excel Table calculates costs for a range of values of s. A graph shows the

    results. You may input the first value of sand the interval between points. To home in on the

    optimum, adjust the first value until the graph is U-shaped, and then lower the interval to 1.

    However, the result is only optimal for the value of Qthat you simulated. To find an overall

    optimum, you must repeat the simulation for a series of values of Q, and use the table to find the

    best reorder level for each Q. Record those values and select the one with lowest cost.

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    Periodic Review. Q=30, D=10, varD=10

    Gamma InterDemandTime: Mu= 0.1, Std=0.1. Discrete LT: Mu= 3, Std=1.41Change the design by entering numbers in the yellow boxes, and by checking or unchecking the selection boxes.

    Theoretical Values Mean Var StDev

    LTD 30.00 230.00 15.166

    LT+1 Dem 40.00 240.00 15.492

    LT 3.00 2.00 1.414mean 0.1 mean 3 Inter-Demand Time 0.1 0.01 0.100

    StDev 0.1 StDev 1.41421356 Demand/period 10.00 10.00 3.162

    Minimum Q = S-s 30 IDT f(IDT) LT f(LT) Conversion Formulas:

    0 0.5 0 Mean Var StDev

    0.033333333 1 0.2 Demand per Period: 10 10 3.162

    0.066666667 2 0.2 Inter-demand Time: 0.1 0.01 0.100

    0.1 3 0.2

    Runin Periods 5,000 0.133333333 4 0.2 Inter-Demand Time 0.1 0.01 0.100

    Run Periods 50,000 0.166666667 5 0.2 Demand/period 10 10 3.162

    RNSeed 5235 0.2 0.5 6 0

    mean 0.1 mean 3

    StDev 0.1 StDev 1.41421356

    Discrete LT

    Gamma IDT

    Discrete IDT (not in use)

    Gamma LT (not in use)

    Gamma IDT? TRUE

    Periodic Review

    Type of Review

    Minimum Order Quantity

    Run Controls

    Click here to view simulation results.

    Click here to view graphs of the distributions

    Current Simulation Design:

    Simulation of a Min-Max (s,S) Inventory System in Continuous Time: Discrete or Continuous Review

    Inter-demand time (IDT) Lead Time (LT)

    Gamma LT? FALSEPeriodic Review? TRUE

    Simulate

    Delete Old Data

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    LinksEOQ = 32 Number of columns of data available: 8

    Min order Qty, Q = S-s = 50 Use data in column number: 8 Choose your data set hereOrder-up-to level, S = 80 Reorder trigger level (to vary): s = 30 Set the Reorder Level here

    Mean = 29.980 35.014 41.017 57.046Variance = 230.033 242.520 239.770 489.283

    E[Inventory] = 6.476 4.293 2.138 24.736 1.00$ Inventory Cost per unit time

    E[Backorders] = 6.456 9.307 12.156 1.783 9.00$ Backorder Cost per unit time

    P[Backorders>0] = 0.478 0.577 0.697 0.158 -$ Cost whenever Backorders > 0

    Backorder Rate = 0.087 0.105 0.127 1.684 -$ Cost per unit BackorderedDemands=500784, Orders=9100, Periods=50000, Orders/Period= 0.182 50.00$ Fixed Cost of Ordering

    For s=30, S=80, Total Cost per Unit Time = 49.88$

    Crossings=0 Crossings per Delivery = 0.000

    Analysis of Service Level Accuracy. Target Probability of No Backorders: 0.95 This target's meaning:For "Shortfall",

    it means "% of time during which

    To achieve target probability, s= 55 61 66 44 there are some backorders."

    S=s+Q: 105 111 116 94 For "Shorfall@Delivery",

    Actual P(no BO@Deliv): 0.895 0.956 0.984 0.696 it means "% of orders for

    Actual P(no BO, time av.): 0.989 0.997 0.999 0.952 which some backorders exist

    Predicted by LTD 0.956 0.988 0.996 0.792 when the order arrives."

    Predicted by LT+1 Dem 0.795 0.895 0.949 0.580

    Search for Minimum Cost Reorder Level (s) holding constant S-s=50

    Graph of Cost vs s, starting at

    First value of s for the graph: 35 this value, and incrementing byInterval between values: 1 this amount.

    Performance Statistics for

    s=30, S=80Unit Costs

    Shortfall

    @Deliv.LTDem LT+1 Dem Shortfall

    Minimum Cost = $47.83

    at s =37, S =87

    Using simulated distribution of: LTDemShortfall

    @Deliv.LT+1 Dem

    Make sure "Calculation" is set to "Automatic". If it is

    not, then press F9 to recalculate the cost curve

    whenever you change anything.

    Shortfall

    Periodic Review, Q=50. D=10 (Var=10). Discrete LT: Mu= 3, Std=1.41

    View Graphs of Distributions

    View Simulation Data

    Go To Simulation Design

    View Performance Summary

    Gamma InterDemandTime: Mu= 0.1, Std=0.1 Crossings/Delivery=0

    47484950515253

    0 20 40 60

    Cost

    Reorder Level, s

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    LinksPeriodic Review, Q=50. D=10 (Var=10). Discrete LT: Mu= 3, Std=1.41

    View Graphs of Distributions

    View Simulation Data

    View Performance SummaryGamma InterDemandTime: Mu= 0.1, Std=0.1 Crossings/Delivery=0

    Change which simulation

    is graphed by changing the

    column number in cell G5.

    Page Down for

    cumulative

    distributions

    Graphs of Distributions for simulation run number 8

    0.01 0.055 0.1 0.145 0.19 0.235 0.28

    IDT: Mean = 0.1, CV = 1, Gamma

    0 1 2 3 4 5 6

    LT: Mean = 3, CV = 0.471, Discrete

    0

    0.005

    0.01

    0.015

    0.02

    0.025

    0.03

    0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170

    LTDem

    LT+1 Dem

    Shortfall

    0

    0.005

    0.01

    0.015

    0.02

    0.025

    0.03

    0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170

    LTDem

    Shortfall @Deliv.

    LT+1 Dem

    Periodic Review, Q=50. D=10 (Var=10). Discrete LT: Mu= 3, Std=1.41Gamma InterDemandTime: Mu= 0.1, Std=0.1 Crossings/Delivery=0

    0.00

    0.20

    0.40

    0.600.80

    1.00

    0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170

    Cumulative Distributions

    LTDem

    Shortfall @Deliv.

    LT+1 Dem

    Shortfall

    Periodic Review, Q=50. D=10 (Var=10). Discrete LT: Mu= 3, Std=1.41

    Gamma InterDemandTime: Mu= 0.1, Std=0.1 Crossings/Delivery=0

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    LinksPeriodic Review, Q=50. D=10 (Var=10). Discrete LT: Mu= 3, Std=1.41

    View Graphs of Distributions

    View Simulation Data

    View Performance Summary

    Gamma InterDemandTime: Mu= 0.1, Std=0.1 Crossings/Delivery=0

    Description of Simulation Data being Viewed:

    Inputs: Outputs:

    Runin Periods 5,000 SimTime 50,000

    Run Periods 50,000 Demands 500,784

    Q = S-s 50 Orders 9,100

    Exp. Demand 10 Deliver ies 9,100

    Var. Dmd (approx) 10 Crossings 0RNSeed 5235 Cross/Deliv 0

    Periodic Review? TRUE

    Gamma LT? FALSE

    Gamma IDT? TRUE

    Exp. Inter-Demand Time 0.1 Shortfall, Avg. 57.046254

    StDev Inter-Demand Time 0.1 Shortfall, var. 489.28271

    Exp. LT 3 Shortfall@Deliv. Avg. 35.013956

    StDev LT 1.41421356 Shortfall@Deliv. var. 242.52035

    Exp LTD 30 LTD Avg. 29.98033

    Var LTD 230 LTD var. 230.03291

    Exp D(LT+1) 40 LT+1 Dem Avg 41.017363

    Var D(LT+1) 240 LT+1 Dem Var 239.76981

    Input Distributions: Below Output Distributions: Farther Below

    Inter-Demand Time Distribution: Ignore Discrete. Gamma used. Distribution Actually Used:Gamma Parameters: 1.000 0.100 IDT: Mean = 0.1, CV = 1, Gamma

    Discrete IDT F(IDT) f(IDT) Gamma IDT f(IDT) Gamma IDT f(IDT)

    0.000 0.500 0.500 0.010 9.048 0.010 9.048

    0.033 0.500 0.000 0.055 5.769 0.055 5.769

    0.067 0.500 0.000 0.100 3.679 0.100 3.679

    0.100 0.500 0.000 0.145 2.346 0.145 2.346

    0.133 0.500 0.000 0.190 1.496 0.190 1.496

    0.167 0.500 0.000 0.235 0.954 0.235 0.954

    0.200 1.000 0.500 0.280 0.608 0.280 0.608

    Will Gamma overflow? FALSE

    Lead Time Distribution: Ignore Gamma. Discrete used. Distribution Actually Used:

    Gamma Parameters: 4.500 0.667 T: Mean = 3, CV = 0.471, Discrete

    Discrete LT iscrete F(LT) iscrete f(LT) Gamma LT amma f(LT) Discrete LT f(IDT)

    0.000 0.000 0.000 0.300 0.005 0.000 0.000

    1.000 0.200 0.200 1.650 0.259 1.000 0.200

    2.000 0.400 0.200 3.000 0.277 2.000 0.200

    3.000 0.600 0.200 4.350 0.134 3.000 0.200

    4.000 0.800 0.200 5.700 0.046 4.000 0.200

    5.000 1.000 0.200 7.050 0.013 5.000 0.200

    6.000 1.000 0.000 8.400 0.003 6.000 0.000

    Will Gamma overflow? FALSE

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    Order Crossing Simulation Partial Simulation Results Theory

    (s, S) with S=0 demands 452 Shortfall Leadtime LeadtimeContinuous time! orders placed 14 Shortfall @ Delivery Demand Demand

    Q = S-s 30 deliveries 13 Mean 43.35 60.62 26.69 30.00

    Exp. Demand 10 Number of Crossings 1 Variance 248.71 153.59 226.90 230.00

    Var. Dmd (approx) 10

    RNSeed 5235

    Periodic Review? TRUE Periodic Review. Q=30: D=10, var=10: L= 3, Std=1.41

    Gamma LT? FALSE

    Gamma IDT? TRUE

    Exp. IDT 0.1

    StDev IDT 0.1

    Exp. LT 3

    StDev LT 1.41421

    Current Time 55.556

    Arriving Inventory Order Lead Delivery - Leadtime Inv. before orders Order Pi

    Period Dmd Orders On-Hand On-Order Position Quantity Time Period Demand Delivery crossed 1

    5000 -27 0 -27

    5000.047463 1 -28 0 -28

    5000.118557 1 -29 0 -29

    5000.11895 1 -30 0 -30

    5000.453041 1 -31 0 -31

    5000.509626 1 -32 0 -32

    5000.76021 1 -33 0 -33

    5001 -33 33 0 33 4 5005 0 5005

    5001.154046 1 -34 33 -1

    5001.264099 1 -35 33 -2

    5001.318424 1 -36 33 -3

    5001.330007 1 -37 33 -4

    5001.431884 1 -38 33 -5

    5001.708118 1 -39 33 -6

    5001.746788 1 -40 33 -7

    5001.82104 1 -41 33 -8

    5001.85482 1 -42 33 -9

    5001.938805 1 -43 33 -10

    5002.244994 1 -44 33 -11

    5002.280199 1 -45 33 -12

    5002.303541 1 -46 33 -13

    5002.344361 1 -47 33 -14

    5002.381167 1 -48 33 -15

    5002.453742 1 -49 33 -16

    5002.753257 1 -50 33 -17

    5002.770789 1 -51 33 -18

    5003.033741 1 -52 33 -19

    5003.129288 1 -53 33 -20

    5003.131748 1 -54 33 -21

    5003.139099 1 -55 33 -22

    5003.144072 1 -56 33 -23

    5003.445661 1 -57 33 -24

    5003.464883 1 -58 33 -25

    5003.515421 1 -59 33 -26

    5003.959563 1 -60 33 -27

    5004.059034 1 -61 33 -28

    5004.282059 1 -62 33 -29

    5004.308 1 -63 33 -30

    5004.463619 1 -64 33 -31

    5004.552588 1 -65 33 -32

    5004.57251 1 -66 33 -33

    5004.585094 1 -67 33 -34

    5004.59645 1 -68 33 -35

    5004.85119 1 -69 33 -36

    5004.935838 1 -70 33 -37

    5004.939203 1 -71 33 -385004.98294 1 -72 33 -39

    5005 -72 72 0 39 2 5007 0 5005

    5005 33 -39 39 0 -39 -72 5005

    -80

    -70

    -60

    -50

    -40

    -30

    -20

    -10

    0

    4995

    5000

    5005

    5010

    5015

    5020

    5025

    5030

    Periodic Review. Q=30: D=10, var=10: L= 3, Std=1.41

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    Arriving Inventory Order Lead Delivery - Leadtime Inv. before orders Order Pi

    Period Dmd Orders On-Hand On-Order Position Quantity Time Period Demand Delivery crossed 1

    5006.045509 1 -52 39 -13

    5006.066182 1 -53 39 -14

    5006.082214 1 -54 39 -15

    5006.119373 1 -55 39 -16

    5006.132403 1 -56 39 -17

    5006.197546 1 -57 39 -18

    5006.550895 1 -58 39 -195007 39 -19 0 -19 -19 -58

    5007.128251 1 -20 0 -20

    5007.317277 1 -21 0 -21

    5007.338246 1 -22 0 -22

    5007.39217 1 -23 0 -23

    5007.41161 1 -24 0 -24

    5007.412227 1 -25 0 -25

    5007.622616 1 -26 0 -26

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    Sheet: Trace File: 186992628.xls.ms_office

    Arriving Inventory Order Lead Delivery - Leadtime Inv. before orders Order Pi

    Period Dmd Orders On-Hand On-Order Position Quantity Time Period Demand Delivery crossed 1

    5013.621019 1 -27 0 -27

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    5015 -34 34 0 34 3 5018 0 5018

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    5016.325344 1 -45 34 -11

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    5016.466211 1 -47 34 -135016.560876 1 -48 34 -14

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    5018 34 -32 32 0 -32 -66 5018

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    5020 32 -15 0 -15 -15 -47

    5020.443185 1 -16 0 -16

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    5020.825711 1 -25 0 -25

    5021 035497 1 26 0 26

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    Sheet: Trace File: 186992628.xls.ms_office

    Arriving Inventory Order Lead Delivery - Leadtime Inv. before orders Order Pi

    Period Dmd Orders On-Hand On-Order Position Quantity Time Period Demand Delivery crossed 1

    5022.261045 1 -37 35 -2

    5022.263916 1 -38 35 -3

    5022.271804 1 -39 35 -4

    5022.316076 1 -40 35 -5

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    5028.516994 1 -24 0 -245028.634542 1 -25 0 -25

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    Sheet: Trace File: 186992628.xls.ms_office

    Arriving Inventory Order Lead Delivery - Leadtime Inv. before orders Order Pi

    Period Dmd Orders On-Hand On-Order Position Quantity Time Period Demand Delivery crossed 1

    5038.55365 1 -47 33 -14

    5038.578496 1 -48 33 -15

    5038.75299 1 -49 33 -16

    5038.824419 1 -50 33 -17

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    5040.157764 1 -65 64 -1

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    5040.847826 1 -69 64 -5

    5040.920234 1 -70 64 -6

    5041 33 -37 31 -6 -37 -70 5041

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    Sheet: Trace File: 186992628.xls.ms_office

    Arriving Inventory Order Lead Delivery - Leadtime Inv. before orders Order Pi

    Period Dmd Orders On-Hand On-Order Position Quantity Time Period Demand Delivery crossed 1

    5046.782132 1 -28 0 -28

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    Runin Periods 5,000 5,000 5,000 5,000

    Run Periods 50,000 50,000 50,000 50,000

    Q = S-s 20 20 10 50

    Exp. Demand 10 10 10 10

    Var. Dmd (approx) 10 10 10 10

    RNSeed 5235 5235 5235 5235Periodic Review? FALSE TRUE TRUE TRUE

    Gamma LT? FALSE FALSE FALSE FALSE

    Gamma IDT? TRUE TRUE TRUE TRUE

    Exp. Inter-Demand Time 0.1 0.1 0.1 0.1

    StDev Inter-Demand Time 0.1 0.1 0.1 0.1

    Exp. LT 3 3 3 3

    StDev LT 1.4142136 1.4142136 1.4142136 1.4142136

    Exp LTD 30 30 30 30

    Var LTD 230 230 230 230

    Exp D(LT+1) 40 40 40 40

    Var D(LT+1) 240 240 240 240

    SimTime 50,000 50,000 50,000 50,000

    Demands 501,009 500,940 501,008 500,784

    Orders 25,050 20,110 34,155 9,100

    Deliveries 25,050 20,112 34,154 9,100

    Crossings 5,149 1,600 8,476 0

    Cross/Deliv 0.2055489 0.0795545 0.2481701 0

    LTD Avg. 30.051018 30.004177 29.979007 29.98033

    LTD var. 229.0572 230.83888 231.78743 230.03291

    "LT+1 Dem" or "LTD", Avg. 30.051018 41.033313 41.295251 41.017363

    "LT+1 Dem" or "LTD", Var. 229.0572 240.86912 240.24175 239.76981S-Inv. (Time Av) Avg. 39.530602 42.216215 37.395718 57.046254S-Inv. (Time Av) var. 184.53422 241.16825 155.04833 489.28271

    s-Inv @Deliv. Avg. 30.051018 34.982946 34.874451 35.013956

    s-Inv @Deliv. var. 150.95101 194.4201 142.49282 242.52035

    x x x x x

    0 0 0 0

    1 1 1 1

    2 2 2 2

    3 3 3 3

    4 4 4 4

    5 5 5 56 6 6 6

    7 7 7 7

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    12 12 12 12

    13 13 13 13

    14 14 14 14

    15 15 15 15

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    22 22 22 22

    23 23 23 23

    24 24 24 24

    25 25 25 25

    26 26 26 26

    27 27 27 27

    28 28 28 28

    29 29 29 29

    30 30 30 30

    31 31 31 31

    32 32 32 32

    33 33 33 33

    34 34 34 34

    35 35 35 35

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    37 37 37 37

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    40 40 40 40

    41 41 41 41

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    44 44 44 44

    45 45 45 45

    46 46 46 46

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    56 56 56 56

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    144 144 144 144

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    170 170 170 170-Inv -Inv -Inv -Inv -Inv

    0 0 0 0

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    0.0075703 0.007496 0.0080825 0.0045078

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    0.0002324 0.0012215 6.984E-05 0.0100465

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    2.668E-05 0.00029 6.939E-06 0.0076158

    8.635E-06 0.0002134 6.087E-06 0.0071293

    1.253E-05 0.0001595 6.327E-06 0.0069482

    1.67E-06 0.0001069 4.957E-06 0.0065961

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    0 0 0 0

    0 0 0 00 0 0 0

    0 0 0 0

    0 0 0 0

    0 0 0 0

    0 0 0 0

    0 0 0 0

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    0 0 0 0

    0 0 0 0

    0 0 0 0

    0 0 0 0

    0 0 0 0

    0 0 0 00 0 0 0

    0 0 0 0

    0 0 0 0

    0 0 0 0

    0 0 0 0

    Discrete IDT Discrete IDT Discrete IDT Discrete IDT Discrete IDT

    0 0 0 0

    0.0333333 0.0333333 0.0333333 0.0333333

    0.0666667 0.0666667 0.0666667 0.0666667

    0.1 0.1 0.1 0.1

    0.1333333 0.1333333 0.1333333 0.1333333

    0.1666667 0.1666667 0.1666667 0.1666667

    0.2 0.2 0.2 0.2

    Discrete F(IDT) crete F(IDT) crete F(IDT) crete F(IDT) crete F(IDT)

    0.5 0.5 0.5 0.5

    0.5 0.5 0.5 0.5

    0.5 0.5 0.5 0.5

    0.5 0.5 0.5 0.5

    0.5 0.5 0.5 0.5

    0.5 0.5 0.5 0.5

    1 1 1 1Discrete LT Discrete LT Discrete LT Discrete LT Discrete LT

    0 0 0 0

    1 1 1 1

    2 2 2 2

    3 3 3 3

    4 4 4 4

    5 5 5 5

    6 6 6 6

    Discrete F(LT) iscrete F(LT) iscrete F(LT) iscrete F(LT) iscrete F(LT)

    0 0 0 0

    0.2 0.2 0.2 0.20.4 0.4 0.4 0.4

    0.6 0.6 0.6 0.6

    0.8 0.8 0.8 0.8

    1 1 1 1

    1 1 1 1

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    5,000 5,000 5,000 5,000

    50,000 50,000 50,000 50,000

    50 50 50 50

    10 10 10 10

    1.6 1.6 10 10

    5235 5235 5235 5235TRUE FALSE FALSE TRUE

    FALSE FALSE FALSE FALSE

    TRUE TRUE TRUE TRUE

    0.1 0.1 0.1 0.1

    0.04 0.04 0.1 0.1

    3 3 3 3

    1.4142136 1.4142136 1.4142136 1.4142136

    30 30 30 30

    204.8 204.8 230 230

    40 40 40 40

    206.4 206.4 240 240

    50,000 50,000 50,000 50,000

    500,285 500,203 500,771 500,784

    9,205 10,004 10,015 9,100

    9,205 10,004 10,015 9,100

    0 0 32 0

    0 0 0.0031952 0

    30.322651 29.434026 30.02666 29.98033

    205.12545 210.07711 232.50503 230.03291

    40.574253 29.434026 30.02666 41.017363

    206.88588 210.07711 232.50503 239.7698157.890613 54.706093 54.482139 57.046254

    458.26579 419.01377 440.23707 489.28271

    34.671157 29.434026 30.02666 35.013956

    217.07481 210.07711 231.62635 242.52035

    x x x x

    0 0 0 0

    1 1 1 1

    2 2 2 2

    3 3 3 3

    4 4 4 4

    5 5 5 56 6 6 6

    7 7 7 7

    8 8 8 8

    9 9 9 9

    10 10 10 10

    11 11 11 11

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    12 12 12 12

    13 13 13 13

    14 14 14 14

    15 15 15 15

    16 16 16 16

    17 17 17 1718 18 18 18

    19 19 19 19

    20 20 20 20

    21 21 21 21

    22 22 22 22

    23 23 23 23

    24 24 24 24

    25 25 25 25

    26 26 26 26

    27 27 27 27

    28 28 28 28

    29 29 29 29

    30 30 30 30

    31 31 31 31

    32 32 32 32

    33 33 33 33

    34 34 34 34

    35 35 35 35

    36 36 36 36

    37 37 37 37

    38 38 38 3839 39 39 39

    40 40 40 40

    41 41 41 41

    42 42 42 42

    43 43 43 43

    44 44 44 44

    45 45 45 45

    46 46 46 46

    47 47 47 47

    48 48 48 48

    49 49 49 4950 50 50 50

    51 51 51 51

    52 52 52 52

    53 53 53 53

    54 54 54 54

    55 55 55 55

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    56 56 56 56

    57 57 57 57

    58 58 58 58

    59 59 59 59

    60 60 60 60

    61 61 61 6162 62 62 62

    63 63 63 63

    64 64 64 64

    65 65 65 65

    66 66 66 66

    67 67 67 67

    68 68 68 68

    69 69 69 69

    70 70 70 70

    71 71 71 71

    72 72 72 72

    73 73 73 73

    74 74 74 74

    75 75 75 75

    76 76 76 76

    77 77 77 77

    78 78 78 78

    79 79 79 79

    80 80 80 80

    81 81 81 81

    82 82 82 8283 83 83 83

    84 84 84 84

    85 85 85 85

    86 86 86 86

    87 87 87 87

    88 88 88 88

    89 89 89 89

    90 90 90 90

    91 91 91 91

    92 92 92 92

    93 93 93 9394 94 94 94

    95 95 95 95

    96 96 96 96

    97 97 97 97

    98 98 98 98

    99 99 99 99

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    100 100 100 100

    101 101 101 101

    102 102 102 102

    103 103 103 103

    104 104 104 104

    105 105 105 105106 106 106 106

    107 107 107 107

    108 108 108 108

    109 109 109 109

    110 110 110 110

    111 111 111 111

    112 112 112 112

    113 113 113 113

    114 114 114 114

    115 115 115 115

    116 116 116 116

    117 117 117 117

    118 118 118 118

    119 119 119 119

    120 120 120 120

    121 121 121 121

    122 122 122 122

    123 123 123 123

    124 124 124 124

    125 125 125 125

    126 126 126 126127 127 127 127

    128 128 128 128

    129 129 129 129

    130 130 130 130

    131 131 131 131

    132 132 132 132

    133 133 133 133

    134 134 134 134

    135 135 135 135

    136 136 136 136

    137 137 137 137138 138 138 138

    139 139 139 139

    140 140 140 140

    141 141 141 141

    142 142 142 142

    143 143 143 143

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    144 144 144 144

    145 145 145 145

    146 146 146 146

    147 147 147 147

    148 148 148 148

    149 149 149 149150 150 150 150

    151 151 151 151

    152 152 152 152

    153 153 153 153

    154 154 154 154

    155 155 155 155

    156 156 156 156

    157 157 157 157

    158 158 158 158

    159 159 159 159

    160 160 160 160

    161 161 161 161

    162 162 162 162

    163 163 163 163

    164 164 164 164

    165 165 165 165

    166 166 166 166

    167 167 167 167

    168 168 168 168

    169 169 169 169

    170 170 170 170-Inv -Inv -Inv -Inv

    0 0 0 0

    0 0 1.494E-05 3.341E-05

    0 0 2.651E-05 1.26E-05

    0 0 7.946E-05 8.524E-05

    0 0 0.0001832 0.0001675

    0 0 0.0002769 0.0002705

    5.41E-06 1.274E-05 0.0006138 0.0005051

    6.858E-05 0.0001772 0.0009107 0.0008976

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    0.0037227 0.0042676 0.0049591 0.0045078

    0.0039013 0.0046395 0.0050332 0.0046368

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    0.007208 0.0081785 0.0083344 0.0076418

    0.0074757 0.0083876 0.0089633 0.0082318

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    0.0080426 0.0089721 0.0096219 0.0087557

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    0.0100284 0.0117812 0.011633 0.0106357

    0.0105418 0.0118338 0.0116918 0.0111452

    0.0107534 0.0121516 0.0120839 0.0113045

    0.0111211 0.0124728 0.0126102 0.0116326

    0.0112604 0.0125568 0.0133272 0.0119498

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    0.0134952 0.0151892 0.0151015 0.01377040.0137968 0.0154375 0.0155995 0.0144156

    0.0140892 0.0158633 0.0157743 0.0143963

    0.0145886 0.016073 0.0163068 0.0146179

    0.0150238 0.0162939 0.0165279 0.0150305

    0.0152636 0.0166225 0.0173991 0.0153612

    0.0157277 0.0170551 0.0173817 0.0155286

    0.0158568 0.0174587 0.0172491 0.0160701

    0.0164053 0.0180052 0.0178794 0.0163454

    0.0168378 0.0185253 0.018371 0.016465

    0.0170838 0.0189861 0.0183541 0.0172905

    0.0176013 0.0194166 0.0181321 0.01679180.0176275 0.0195895 0.0185445 0.0173585

    0.0179724 0.019815 0.0184929 0.0172673

    0.0185533 0.01981 0.0186464 0.0173441

    0.0186034 0.019966 0.0185336 0.0176212

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    0.0181625 0.0175417 0.0175116 0.0172055

    0.0177012 0.0165079 0.0168613 0.0172291

    0.0172089 0.0159598 0.016419 0.0165939

    0.0171109 0.0156787 0.0161042 0.0165851

    0.0164836 0.0157156 0.0158032 0.0160283

    0.0162114 0.0157507 0.0158615 0.01588730.0161613 0.0157103 0.0152213 0.0157737

    0.015901 0.0157424 0.0148847 0.0150993

    0.0156038 0.0153626 0.0144912 0.0148333

    0.0150751 0.0144321 0.0135176 0.0142462

    0.0148303 0.0137607 0.0134812 0.0141148

    0.0141184 0.012913 0.0132191 0.0137565

    0.0137094 0.0123117 0.0126915 0.0132967

    0.0134346 0.0119525 0.0121874 0.0131786

    0.0130292 0.0119234 0.0121468 0.0129615

    0.0128513 0.0116331 0.0115597 0.0124334

    0.0126425 0.0115726 0.0111195 0.0120802

    0.012173 0.0114225 0.0105052 0.0115348

    0.01196 0.0110938 0.0105779 0.0110938

    0.0115263 0.0107004 0.009972 0.011124

    0.0110232 0.0098339 0.009684 0.0105466

    0.0105659 0.0091739 0.0091492 0.0100465

    0.0101311 0.008553 0.008792 0.0098815

    0.0097975 0.0083075 0.0083889 0.0091364

    0.0094959 0.0080424 0.0081624 0.0093107

    0.009108 0.0079662 0.0078752 0.0088438

    0.0088615 0.0077538 0.0071352 0.0083780.008538 0.00751 0.0067203 0.0079701

    0.0082729 0.0070868 0.0063323 0.0076158

    0.0079091 0.0064289 0.0060877 0.0071293

    0.0074739 0.0059003 0.0056185 0.0069482

    0.00699 0.0053121 0.0053086 0.0065961

    0.0065957 0.0048805 0.0048281 0.0062243

    0.0063081 0.0044512 0.0045172 0.0057947

    0.0058463 0.0042007 0.0040206 0.005551

    0.0055363 0.0039733 0.0037065 0.0052786

    0.0051419 0.0036776 0.003469 0.0047339

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    0.0040431 0.0026147 0.0023841 0.0036575

    0.0035685 0.0019711 0.002009 0.0032626

    0.0031609 0.0014542 0.0018601 0.0031173

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    0.0024442 0.0005859 0.0013177 0.0024427

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    0.0022106 0.0003096 0.0011393 0.0021407

    0.0018083 0.0001459 0.000993 0.0019214

    0.0015015 7.449E-05 0.0008017 0.0016252

    0.0011924 3.118E-05 0.0006016 0.0014863

    0.0009468 1.092E-05 0.0005021 0.0013282

    0.0007132 5.792E-06 0.0004031 0.00114540.0004899 1.398E-06 0.0002617 0.0008808

    0.0002888 0 0.0002386 0.0008689

    0.0001734 0 0.0001538 0.0006779

    0.0001001 0 0.000118 0.0005182

    5.357E-05 0 7.862E-05 0.0004595

    3.267E-05 0 8.871E-05 0.0003402

    9.491E-06 0 4.917E-05 0.0002479

    2.245E-06 0 1.921E-05 0.0002348

    0 0 1.553E-05 0.0001817

    0 0 6.476E-06 0.0001534

    0 0 1.1E-05 0.0001289

    0 0 8.386E-06 7.318E-05

    0 0 8.723E-06 5.985E-05

    0 0 1.264E-06 6.286E-05

    0 0 2.795E-07 5.306E-05

    0 0 2.503E-06 2.576E-05

    0 0 2.442E-06 2.415E-05

    0 0 2.247E-06 2.214E-05

    0 0 3.981E-07 1.007E-05

    0 0 2.649E-09 4.035E-06

    0 0 0 1.582E-060 0 0 1.888E-06

    0 0 0 6.731E-07

    0 0 0 3.045E-06

    0 0 0 3.164E-06

    0 0 0 1.382E-07

    0 0 0 0

    0 0 0 0

    0 0 0 0

    0 0 0 0

    0 0 0 0

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    0 0 0 0

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    LTD LTD LTD LTD

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    0 0 0.0001997 0.0003297

    0 0 0.0005991 0.00010990 0 0.0012981 0.0012088

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    0.0117328 0.0159936 0.0182726 0.016044

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    0.0416078 0.0408836 0.0207688 0.0224176

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    0.0231396 0.0268892 0.0181727 0.0194505

    0.0305269 0.0288884 0.020669 0.0206593

    0.0344378 0.0364854 0.0201697 0.0197802

    0.0322651 0.0288884 0.0198702 0.0198901

    0.0212928 0.0208916 0.0193709 0.0201099

    0.01434 0.0112955 0.018672 0.0213187

    0.0090168 0.0082967 0.0187718 0.0201099

    0.0077132 0.0076969 0.0215676 0.0198901

    0.00956 0.0114954 0.0208687 0.0196703

    0.0158609 0.0185926 0.0211682 0.0195604

    0.0249864 0.0291883 0.0204693 0.0172527

    0.0310701 0.0288884 0.0172741 0.0194505

    0.0333514 0.0287885 0.0184723 0.0198901

    0.0321564 0.0257897 0.0204693 0.0197802

    0.0228137 0.019892 0.0204693 0.0172527

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    0.0137968 0.010096 0.0202696 0.0172527

    0.0117328 0.010096 0.0163754 0.019011

    0.0130364 0.0131947 0.0181727 0.01846150.0181423 0.0182927 0.0168747 0.0186813

    0.0216187 0.02509 0.0156765 0.0184615

    0.0296578 0.0272891 0.015976 0.0176923

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    0.0239001 0.0259896 0.0123814 0.0145055

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