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Hello Doug,

When running trac-all -prep and including b0 inhomogeneity correction with epidewarp.fsl I get the following error.

FSL Version is $FSLVersion, must be 3.X or 4.X or 5.X

Looking at the epidewarp.fsl source code I see that the error is occurring because of this section of the code.

set FSLVersion = `cat $FSLDIR/etc/fslversion`; set FSLVerMaj = `echo $FSLVersion | cut -c 1` echo FSLVersion $FSLVersion echo FSLVerMaj $FSLVerMaj if($FSLVerMaj == 3) then set FSLPre = avw set DilFlag = -dil set FSLToFloat = avwmaths_32R set FSLToFloatFlag = () else if($FSLVerMaj == 4) then set FSLPre = fsl set DilFlag = -dilM set FSLToFloat = (fslmaths) set FSLToFloatFlag = (-odt float) else if($FSLVerMaj == 5) then set FSLPre = fsl set DilFlag = -dilM set FSLToFloat = (fslmaths) set FSLToFloatFlag = (-odt float) else echo "FSL Version is $FSLVersion, must be 3.X or 4.X or 5.X" exit 1; endif

Since fsl is now at version 6.0.1 would epidewarp.fsl be compatible with this version?

Could I simply include else if($FSLVerMaj == 6) then set FSLPre = fsl set DilFlag = -dilM set FSLToFloat = (fslmaths) set FSLToFloatFlag = (-odt float) or are these paramaters different under fsl 6.x+?

Best, *Daniel Callow* *PhD Student, Neuroscience and Cognitive Science* Exercise for Brain Health Lab University of Maryland, College Park *ddcc2442@gmail.com ddcc2442@gmail.com* 443-254-6298