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everybody, when i do some regession work in some other software, i neen to use the design matrix generated by SPM, here i need to know what does ”right*bf(1)” and ”left*bf(1)”mean. i find in the spm.mat, there are some structural matrix named xX,xY,xbf, so i want to ask what does "xX,xY,xbf" mean? especially what does "bf" mean here.

thanks very much~~