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For the purpose of running AlphaSim, the only reason you would want to obtain a group brain in tlrc space with EPI resolution is to estimate the smoothing kernel size (FWHM), and such a group map would be something like the standard deviation (or residual error) of the contrast. Thus you would start from the group result, and work backward with 3dfractionize (or 3dresample), not something you are proposing here.