Paul van Delst wrote: > > maxval = ABS( MIN( xdata ) ) > MAX( xdata ) ^ oops. Missing ")" above in previous post -- Paul van Delst A little learning is a dangerous thing; CIMSS @ NOAA/NCEP Drink deep, or taste not the Pierian spring; Ph: (301)763-8000 x7274 There shallow draughts intoxicate the brain, Fax:(301)763-8545 And drinking largely sobers us again. paul.vandelst@noaa.gov Alexander Pope.