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I think you'll just have to make some reasonable assumptions on this one. As you know, the Luftwaffe always preferred to disperse its aircraft around wooded areas wherever possible and you can see Tramecourt woods in the picture above. Secondly, I notice that the base was also home to a Do 17Z unit later in the battle, so that implies the grass runway was a long one - or at least easily extended. Determine the average length of a medium bomber runway and play around with orientations, bearing in mind where the dispersals could have been.