Hello, when we attempt to use Featquery on a mask it works fine but when we use that same mask with a single co-ordinate the following error is obtained: floating point value is Not a Number while executing "format %.4g [ lindex $thevals 11 ] " ("for" body line 251) invoked from within "for { set f 1 } { $f <= $featquery(multiple) } { incr f 1 } { #{{{ setup output dir and logging etc. set mask $origmask cd [ lindex $argv $f ] ..." (file "/usr/share/fsl/5.0/bin/featquery" line 167) When the line: set thestd [ format %.4g [ lindex $thevals 11 ] ] is changed to: set thestd [ format %s [ lindex $thevals 11 ] ] then it works. Is this problem caused by the fact that the std for a single voxel is undefined and trying to print out as format %.4g causes the error?