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Hi Paul, Quick note to rescind the last comment I made previously: - since the mapping from original value in the image to "calibrated unit" (dBZ in this case) is not fixed, your results should vary (i.e., not be consistent) Since the stretch table you are creating maps dBZ to brightness, it should be consistent. Sorry for the misinformation... 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: AIT-655217 Department: Support McIDAS Priority: Normal Status: Closed