The file apparently didn't come through correctly, could you
try again?
My guess is that the nifti file has scale factors in it, which are
causing the AFNI programs to convert them to floats. I don't
remember implementing it that way, but I'm sure somebody
had a good reason to do that.
A first try would be to use the nifti_tool to set the scale
factor to zero:
nifti_tool -mod_hdr -mod_field scl_slope 0.0 -infiles butterfly.nii -prefix \
newbutterfly.nii
I think that will work. Feel free to upload the file again for
me to check this if it doesn't work for you.
rich