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The cnormal option makes the data monotonic in x and normalises the
y-values onto the range [0:1]. Points with the same x-value are
replaced by a single point containing the cumulative sum of y-values
of all data points with lower x-values (i.e. to the left of the
current data point) divided by the total sum of all y-values. This can
be used to obtain a normalised cumulative distribution function from
data (useful when comparing sets of samples with differing numbers of
members).
See also
http://www.gnuplot.info/demo/smooth.htmlsmooth.dem
Autobuild
2016-06-15