The mcsplines option connects consecutive points by cubic splines constrained
such that the smoothed function preserves the monotonicity and convexity of the
original data points. This reduces the effect of outliers.
FN Fritsch & RE Carlson (1980) "Monotone Piecewise Cubic Interpolation",
SIAM Journal on Numerical Analysis 17: 238–246.
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2017-10-25