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Hi Rod, re: > How did you derive the the center point in file coordinates would be: 66,137? #lines in box = 71-61 = 10 #elems in box = 155-119 = 36 Center line = 61 + 10/2 = 66 Center elem = 119 + 36/2 = 137 Cheers, Tom -- **************************************************************************** Unidata User Support UCAR Unidata Program (303) 497-8642 P.O. Box 3000 address@hidden Boulder, CO 80307 ---------------------------------------------------------------------------- Unidata HomePage http://www.unidata.ucar.edu **************************************************************************** Ticket Details =================== Ticket ID: CRZ-518318 Department: Support McIDAS Priority: Normal Status: Closed