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There may or may not be a problem here. The warning is because the scalefactor in the image headers has not been set. If all your data are scaled the same, then there shouldn't be a problem. If they are not, then there may be one. Best regards, -John -----Original Message----- From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] On Behalf Of Tamara Cristescu Sent: Wednesday, June 06, 2007 5:17 PM To: [log in to unmask] Subject: [SPM] error mesage in SPM2 - Dear all, I encountered the following error message while realigning&unwarping my data. Can someone tell me what it is? The analysis works ok, SPM doesn't crash but I was wondering if this a serios problem I have to fix before I go on with the other pre=rpocessing steps. On top of this error message, it seems that all the spm2.ps file are empty. I use SPM2 and Linux 10.2 Any help would be much appreciated. Yours, Tamara Warning: Assuming a scalefactor of 1 for "/home/mriabb/S01/data/S01_900.img". > In spm_vol_ana at 129 In spm_vol>subfunc at 93 In spm_vol>subfunc1 at 62 In spm_vol>subfunc2 at 51 In spm_vol at 37 In spm_realign at 98 In spm_realign_ui>run_ui at 532 In spm_realign_ui at 320