(character) target file type, can be curv, paint (w), mgh, or nii
src_type
(character) source file type, can be curv or paint (w)
outfile
(character) output filename
hemi
(character) hemisphere to run statistics
sval
(character) source file
subj_dir
(character path) if a different subjects directory
is to be used other than SUBJECTS_DIR from shell, it can be
specified here. Use with care as if the command fail, it may not reset
the SUBJECTS_DIR back correctly after the error