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Dear FSLers, I have used --olmax in 'cluster' to get local maxima of a very big cluster in TBSS, which covered more or less the whole skeleton, with: cluster --in=..._tfce_corrp_tstat file --thresh=0.99 --mm --olmax= bart_FA_99_plus_olmax It produced 6 coordinates out of the big cluster. That made me wonder what exactly –-olmax does, how it determines what the local maxima are within a cluster? Also, when using –olmax the output file is like this: Cluster Index Z x y z Are these coordinates of the peak t-score or are they COG coordinates? Any clarification on these two questions would be very much appreciated! Thanks in advance, Bart Bart D. Peters, MD, PhD Research Fellow Zucker Hillside Hospital Feinstein Institute for Medical Research North Shore-LIJ Health System 75-59 263rd Street Glen Oaks, NY 11004 Ph: 718-470-8168