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Richard, You have the low and high ranges reversed in your HILO parameter. The 3rd field for ranges is: rangeh;rangel you have your low range first, where the high range should be first. You should be able to specify if necessary: 5-50;-50--5 The "--" sequence does not cause a problem in my tests. Steve Chiswell Unidata User Support >From: "Richard Yablonsky" <address@hidden> >Organization: UCAR/Unidata >Keywords: 200406302332.i5UNW4u1010774 >Institution: NCSU >Package Version: 5.6 >Operating System: Unix >Hardware Information: Sun Solaris >Inquiry: Hello, > >I am trying to use GDCNTR to plot difference fields. My goal is to display th > e single largest positive value and the single largest negative value. There > fore, I have set my HILO variable as shown below: > >HILO = 1/X#1;X#1///1;1/yes > >Sometimes, the program works correctly, but because my difference field is som > etimes noisy, it has a hard time plotting the two values in certain instances > . Presumably, I can fix this problem by reducing the range, but how do I inc > lude negative values in my range? That is, I want to be able to do something > like this: > >HILO = 1/X#1;X#1/-50--5;5-50//1;1/yes > >However, I do not think that the program likes this negative sign syntax. Is > there a way to get around this? > > > -- NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publically available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.