Thanks so much for the reply, I hadn't noticed the xsave option before which is very useful.
For running new regression on betas, may that also be done using 3ddeconvolve? This is perhaps a silly question, but I am just wondering if there are any extra steps (extra option flags?) needed to run 3ddeconvolve on non-BOLD timeseries BRIK files. Or, may I simply input a statistical BRIK file, and specify how to weight each subbrik with "-stim_file"?
thanks again.