> Could you confirm that I should be using the Inten'[0]' subrick as my overlay and
> the F-stat'[1]' as my threshold value.
Inten'[0]' is the square root of mean squares of the differences among the groups. Sure you can use it for colorization.
> how do I investigate the pairwise comparisons? I included the -diff option in my script
> so I can visualize the output, but how can I quantify which groups are driving my effect?
Use option "-mean" to obtain the effect estimate for each group, which should help you further sort out the group effects.
Gang