This is from a similar area of the field but I picked 12 passes (3 sets of 4). Not sure why I'm doing this other than to just see how far the four combines are off from one another.

Pass 1: 0.37 acres - 208.11 bu/acre
Pass 2: 0.38 acres - 207.89 bu/acre and headed same direction as pass 1
Pass 3: 0.37 acres - 205.41 bu/acre and headed same direction as passes 1 & 2
Pass 4: 0.37 acres - 210.81 bu/acre and headed same direction as passes 1-3

Pass 5: 0.37 acres - 202.70 bu/acre and headed opposite direction as passes 1-4
Pass 6: 0.38 acres - 202.63 bu/acre and headed same direction as pass 5
Pass 7: 0.38 acres - 207.89 bu/acre and headed same direction as passes 5 & 6
Pass 8: 0.37 acres - 210.81 bu/acre and headed same direction as passes 5-7

Pass 9: 0.37 acres - 208.11 bu/acre and headed opposite direction as passes 5-6
Pass 10: 0.37 acres - 213.51 bu/acre and headed same direction as pass 9
Pass 11: 0.38 acres - 213.16 bu/acre and headed same direction as passes 9&10
Pass 12: 0.37 acres - 208.11 bu/acre and headed same direction as passes 9-11