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Marcus D. Hanwell authored
New API in vtkPlot to set an indexed label array, and new code in vtkChartXY to use this if available. Modifications to vtkPlotPoints return the actual index of the point found, so that code downstream can look up further information on a point if necessary/desirable. Change-Id: I7e6e57f69ca2ed469715962841d7a343477e0792
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