GNU Info

(gnuplot.info)histeps

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 The `histeps` style is only relevant to 2-d plotting.  It is intended for
 plotting histograms.  Y-values are assumed to be centered at the x-values;
 the point at x1 is represented as a horizontal line from ((x0+x1)/2,y1) to
 ((x1+x2)/2,y1).  The lines representing the end points are extended so that
 the step is centered on at x.  Adjacent points are connected by a vertical
 line at their average x, that is, from ((x1+x2)/2,y1) to ((x1+x2)/2,y2).

 If `autoscale` (Note: autoscale ) is in effect, it selects the xrange from
 the data rather than the steps, so the end points will appear only half as
 wide as the others.

 `histeps` is only a plotting style; `gnuplot` (Note: gnuplot ) does not have
 the ability to create bins and determine their population from some data set.