afni.nimh.nih.gov

Hi Jayna,

Daniel suggested that you might just want a union mask, and
re-reading your first post supports that.

For a union mask you can either run 3dcalc on the previous
output and use 'step(a)', or you can re-run the first command,
applying an 'or' or perhaps 'step' to the whole expression. E.g.

expr 'step(step(a-4.2)+2*step(b-2.9)+4*step(c-3.1))'

- rick