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> Taking the rows that > corresponds to the row of the contrast doesn't seem to give the same > values as is used by SPM96 when making an images by chosing results > and then a contrast and finally 'write image' in SPM96. By the rows that corresponds to the row of the contrast doesn't seem to give the same values as is used by SPM96 I assume you mean that the values in the rows of SPMt.mat of SPM96 are different from the values in the spmT_????.img of SPM99 for the same contrast. This would be related to my previous email: SPM now uses t images instead of Z images. You can convert a t value with degrees of freedom df to a Z value with the function spm_t2z(t,df) [but Andrew says this function may disappear soon]. -Tom %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%