Hi - - Okay, so the non-transformed mixing matrix should be (21*160) x 25.
So, if I select the two maps I want to add, I originally though that the composite map should be the two corresponding columns of the mixing matrix times a 2 x (N voxels) matrix containing the spatial modes? But that would give me a (21*160) x (N voxels) matrix, right? I think I'm not understanding something correctly here.
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