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Hello everyone, I am creating masks for doing fa mean value statistics and i have a doubt. What is the difference between doing a mask with fsl4.1-fslmaths /usr/share/fsl/data/atlases/JHU/JHU-ICBM-tracts-prob-1mm.nii.gz -thr 17 -uthr 17 -mas mean_FA_skeleton_mask_p-cp.nii.gz maskcs17 fsl4.1-fslmaths /usr/share/fsl/data/atlases/JHU/JHU-ICBM-tracts-prob-1mm.nii.gz -thr 17 -uthr 17 maskcs17 (without the mean_FA_skeleton_mask ) ??? and between using the /usr/share/fsl/data/atlases/JHU/JHU-ICBM-tracts-prob-1mm.nii.gz atlas or the /usr/share/fsl/data/atlases/JHU/JHU-ICBM-tracts-prob-1mm.nii.gz?? thanks in advance, Alba Garin PhD Student Applied Mechanics Department Simulation Unit Paseo Manuel Lardizabal, 15 20018 Donostia-San Sebastian. Spain Tel. +34 943 212 800 (Ext. 2111)