Jon - btw - check out how I chart Histograms (see upload section) - I think you have to change the .ChartType in the code - but it is all there - just remmed out - I call them curve histograms - these are very cool when you evaluate process data - it essentially allow you to have a bunch of histograms overlayed - without clutter - the number of bins in effect determines how much smoothing goes into the Histogram. I think you are right into displaying process data - anyway take a look.