I was wondering if the original fim program is still part of afni -- you would just give it a file to read and it would open the file in 3D (I think it was 3D) and you could click on a voxel as a reference function and it would show all the voxels in volume that correlated with that voxel. It was interactive -- I know 3dfim, for instance, would do the same thing, but create files instead of interactively.... thanks, mb