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The diagram shows the order book sources used in this example. SR1 products (SOFR) are on the A (Pro Rata) algorithm and have a Pro Rata minimum of 2. 

The steps are:

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Table of Contents
maxLevel4
minLevel4

Source #1: SR1U3= 291 aggress

TOP order gets 100 and is filled. 191 left to match.

...

Order

Working Quantity

2

156

3

237

4

316

Source #2: SR1U3-SR1G4 spread = 42 aggress

No TOP.

Pro Rata

Order 1 = 50/200*42 = 10

...

Order

Working Quantity

1

38

2

20

3

60

4

40

Source #2: SR1G4 = 42 aggress 

No TOP.

Pro Rata

Order 1 = 20/200*42 = 4

...