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Programs of the NMRPipe SystemplotXY: Crude X/Y Plot of Text Table Columns.
 
 | Usage: plotXY inName xCol yCol [xLen yLen nullValue]
 Where:
 1. xCol, yCol:    Columns to plot, first is column 0.
 2. xLen and yLen: Sizes of plot on screen in characters.
 3. nullValue:     Value to ignore, if any.
 
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