>If you use the <note,weight> pairs as inputs to an X,Y scatter graph, >Excel will calculate and draw the spline for you (I don't know how you >get the numbers out, though). Then when you drag a >point on the graph, there is no ambiguity about which data to update >and it just does it. I expect the spline it draws would match pretty >closely the one you're calculating. Easy enough to check. > >-Mark Aha! That might do the trick. Inputting (by cell reference or manually) the data point numbers obtained from the scatter chart into the data point positions in the original setup might do the trick. Hey, I'll try it. Ron N
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