FINDING THE VALUE OF N

To achieve 219 false segment-matches for both randoms and relatives, a value for N of 9 clearly works best. That relatives and randoms have the same number of false segment-matches is a corollary of the obvious assumption that the 187 extra relative segment-matches are all real.

This method depends upon the false segment-matches arising in the yellow areas balancing the real segment-matches arising in the deleted areas - something which we judged reasonable but which is unproven. Our triangulation discussion does show a false segment-match in a yellow area.