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HI,

Apologies if this is more related to scripting than fsl directly.

I have a series of individual roi images (all  from the same individual and in functional space)  that I would like to merge together into a single image.  I have tried scripting this using a for loop with fslmaths  but (of course) only the last image in the list is saved;
e.g. for i in 1.nii.gz 2.nii.gz etc, do fslmaths base_image -add ${i};done

Any help appreciated