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What issue? The "smoothness" of the curve should be corrected by the precision parametzer as suggested above, and the issue with the curve going above or below the actual data points cant be solved. If you interpolation a spline between data points, and the y values of the data points are not monot...

Hey, not a single reply yet ..
pls help..how to solve this issue.

Any solution this issue.
I have same issue in ireport. pls reply if any one got solution of it.