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Hi Tennessee, I just want to suggest that the straight line segments in contours actually serve a useful visualization purpose. Straight segments tell you that you have zoomed in far enough that there are no longer underlying data points in the region covered by the screen, and that the visible contours are interpolations between a few data points that lie beyond the screen edge. Smoothing the lines into curves hides this information from users. Consider the following wonderful quote from Mark Twain: I was gratified to be able to answer promptly, and I did. I said I didn't know. Cheers, Bill
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