OD error example

Example 1: 1x 4.5m, 20x 2m, 12.3 e for OD

Theoretical: http://www.wolframalpha.com/input/?i=maximize+4.5+%28sqrt%281+%2B+a%2F4%29+-+1%29+%2B+20+2+%28sqrt%281+%2B+b%2F4%29+-+1%29+with+a+%2B+20+b+%3D+12.3+and+b+%3E+0
All e to big mex --> 4.584 m

Current: 12.3 e split on 4.5² + 20 * 2² -> 0,1227 e/m² -> 2.4845 e for big mex, 0.4908 e for small mexes each
-> 2 * 20 * 0.0596 = 2.383 (from 20 2m mexes)
+  4.5 * 0.273     = 1.23 (from 1 big mex)
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                     3.61 m from OD
Almost a full metal per second lost (0.974), that's more than 10%...