"Unfortunately the day we were particularly interested in (Monday, the sixteenth) when heavy aerial activity was seen was not supplied and the following day, the eighteenth had been substituted instead. In addition the scale of 45.1 Nmiles, which was appropriate on the first, was found to be 150.0 Nmiles on the second. The filters disabled were different but I have no knowledge of how significant that would be under the circumstances." http://globalskywatch.com/chemtrails/ubbthreads.php?ubb=showflat&Number=9775#Post9775