Technical report: Experiments on the number of contributors, two fewer and two more

It is possible for a mixture to be interpreted assuming two fewer or two additional contributors than the target N. However, not much work has been done to show the impact of assuming N-2 or N+2 contributors to a mixture. In this document [PDF, 910 KB] we describe the impact of assuming N-2 or N+2 contributors on the LR for 49 GlobalFiler™ mixtures.