Hi FSL experts, I've been trying to do a higher level analysis using as inputs some lower level copes from previous analyses. I'm trying to compare one of these copes generated in a previous analysis with another cope of a similar analysis I've manually inverted using fslswapdim (fslswapdim original_cope1 -x y z inverted_cope1). I've tried running fixed and mixed effects models and reviewing the log I notice I get an error in the Higher-level input files preparation step, specifically in the fslmaths mean_func -Tmean mean_func operation. I'm pasting the error below: /usr/share/fsl-4.1/bin/fslmaths mean_func -Tmean mean_func missing operand at _@_ in expression " _@_* 54.59966897163122" (parsing expression " * 54.59966897163122") invoked from within "expr $mean_lcon_incr * [ exec sh -c "cat $feat_files($session)/design.lcon" ] " (procedure "feat5:proc_gfeatprep" line 270) invoked from within "feat5:proc_gfeatprep " ("for" body line 35) invoked from within "for { set argindex 1 } { $argindex < $argc } { incr argindex 1 } { switch -- [ lindex $argv $argindex ] { -I { incr argindex 1 set ses..." (file "/usr/share/fsl-4.1/bin/feat" line 137) Any advice you could offer regarding the correct way to run a higher-level analysis on a cope that's been inverted through fslswapdim would be greatly appreciated. Best regards, Tirso Gonzalez-Alam PhD Student, University of York.