Can one of the SPM authors (or anyone else) tell me what the k, l, and m stand for in the box definition of a VOI? I assume a combination of x, y, and z dimensions. I'm not familiar with those abbreviations (gee, I hope they're not really obvious!!). Thanks. ________________________________ David A. Kareken, Ph.D., ABPP Board Certified Clinical Neuropsychologist Assistant Professor & Director Neuropsychology Section, Department of Neurology RI 1773 Indiana University School of Medicine Indianapolis, IN 46202 (317) 274-7327 (voice) (317) 274-1337 (fax)