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Dear SPM-experts, We have a design with 5 regressors (A-E), where 2 might be correlated (C & D) and which we would like to orthogonalize: A B C D E Is there a way to only orthogonalize D to C but leave the remaining regressors unchanged (as opposed to spm_orth which does serial orthogonalization of all regressors, right?)? Thank you and best regards, Andreas -- Andreas Hahn, MSc PhD Functional, Molecular & Translational Neuroimaging Department of Psychiatry and Psychotherapy Medical University of Vienna, Austria Phone: +43-1-40400-2320 Email: [log in to unmask] Web: http://www.meduniwien.ac.at/neuroimaging/