I am looking for software recommendations for fitting engine dynamometer fuel consumption data into iso-BSFC-line contour plots (e.g., BMEP vs RPM with lines of constant BSFC). What have you used in the past? What would you recommend? I have used SigmaPlot previously to do this but I have found it difficult to use. It requires the data to pass through a 3D smoothing sub-routine and the sub-routine fails on more than half of the data sets that I have put through it.
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