Computing prior on underlying anatomy (non-truncated streamlines only)

Segmentation fault 

Darwin macprolim446.local 14.5.0 Darwin Kernel Version 14.5.0: Wed Jul 29 02:26:53 PDT 2015; root:xnu-2782.40.9~1/RELEASE_X86_64 x86_64

trac-preproc exited with ERRORS at Fri Oct  2 19:38:55 BRT 2015