Hi,

I'm getting an NAN value for some surfaces but not for others. Any ideas? Both surfaces below were generated using an identical process.

[yigal@schnook sph_sm20]$ pwd /autofs/space/ventzl_001/users/SUBJECTS_DIR/mano010/bold/EMexec3/sph_sm20 [yigal@schnook sph_sm20]$ mris_fwhm --i e001-rh.bhdr --subject average7 --hemi rh average7 rh white Number of vertices 163842 Number of faces 327680 Total area 65350.234375 GroupSurface 0 FIX_VERTEX_AREA 1 AvgVtxArea 0.398861 AvgVtxDist 0.724276 StdVtxDist 0.238694 INFO: bvolumeRead: min = -0.473817, max = 0.363422 Polynomial detrending, order = 0 Computing spatial AR1 ar1mn = 0.995086, ar1std = 0.00271769, ar1max = 0.999702 avg vertex dist 0.724276 avg vertex dist 0.724276 fwhm = 12.150420

[yigal@schnook sph_sm20]$ pwd /autofs/space/ventzl_001/users/SUBJECTS_DIR/mano016/bold/EMexec3/sph_sm20 [yigal@schnook sph_sm20]$ mris_fwhm --i e001-rh.bhdr --subject average7 --hemi rh average7 rh white Number of vertices 163842 Number of faces 327680 Total area 65350.234375 GroupSurface 0 FIX_VERTEX_AREA 1 AvgVtxArea 0.398861 AvgVtxDist 0.724276 StdVtxDist 0.238694 INFO: bvolumeRead: min = -0.749406, max = 1.43625 Polynomial detrending, order = 0 Computing spatial AR1 ar1mn = inf, ar1std = nan, ar1max = inf avg vertex dist 0.724276 avg vertex dist 0.724276 fwhm = nan