Hi John,

The only time you would not use -master is if there isn't one
that would be appropriate. Otherwise, that is the way to be
sure all of your datasets have the same dimensions, origins
and grid spacing.

If you are scripting things and need to start with -dimen,
then do it once, and apply it as -master for the others.

---

What is the -rss option you refer to? Is that from another
program, or do you mean -srad? That should always be larger
than a voxel dimension, otherwise there is no reason to use
it (then just stick to each single voxel getting set). Some
people want spheres at certain locations to compute average
time series over them.

- rick