afni.nimh.nih.gov

You should use 3dFWHMx with option -acf. In addition, I believe that the residual file mema++.6_E-S_resZ+tlrc contrains both the residuals and the Z-stat in an alternating order. So, you need to use only the residuals without the Z-stat part. Try something like the following:

3dFWHMx -dset mema++.6_E-S_resZ+tlrc'[0:X:(2)]' -out E-S_FWHMx

and replace the letter 'X' in the above command with the last sub-brick index in the file. Let me know if it works.

Gang