afni.nimh.nih.gov

The problem you are encountering happens because you are using 3dANALYZEtoAFNI first to create a dataset, then using 3dbucket on that. 3dANALYZEtoAFNI was a quick "hack" program to let ANALYZE format files be massaged into AFNI by providing them with a AFNI .HEAD file. Later, I added the ability to AFNI to directly read .hdr/.img ANALYZE filepairs. So I would recommend that you skip the 3dANALYZEtoAFNI step and apply 3dbucket directly to the ANALYZE files.

bob cox