afni.nimh.nih.gov

None of those are zero. I should have given you a more complex command, to take the min of those absmax values to look for zero.

3dTstat -absmax -prefix - X.xmat.1D\' | 3dTstat -prefix - -min 1D:stdin\'

or even
[code3dTstat -absmax -prefix - X.xmat.1D\' | sort -n | head -n 3[/code]

Anyway, there is probably something more complicated going on. Would it be possible for you to mail me that Xmat file? Clicking on my name should show my email address.

Thanks,

- rick