I forgot to post this before! The fix you need to make to the Gismo code (prior to the next release) is to modify arve/gismo/Gismo.cxx to change saveTrack from 5 to 10 in line 75. Richard -- Richard Dubois SLD, Stanford Linear Accelerator Center [log in to unmask] http://www.slac.stanford.edu/~richard/ 650-926-3824 650-926-2923 (FAX)