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Dear All, I have done an analysis comparing two groups of structural MRI scans. However I would like to compare the total amount of grey matter between the two groups. I think this used to be possible in previous SPM releases, but I'm not sure how to do it (or if it is possible) in SPM99b? Many thanks Xavier Xavier Chitnis Section of Cognitive Psychopharmacology Dept. of Psychological Medicine Institute of Psychiatry De Crespigny Park London, SE5 8AF. Tel: 0171 919 3977 Pager: 07669 028 121 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%