+ |----------[#####|##########]--------------------------------------------|
+ ^ ^ ^ ^ ^
+ 2.75% 25% 50% 75% 97.5%
+
+=item B<histogram>
+
+Show a I<histrogram> of the round-trip times. The width of the window is taken
+as round-trip time from 0ms on the left to the I<interval> (the B<-i> option,
+default 1000ms) on the right.
+
+The height of the graph is scaled so that the most-used buckets vertically fills
+the line. The buckets are colored green up to and including the median, yellow
+up to and including the 95th percentile and red for the remainder.
+
+In addition, the histogram is colored, if supported by the terminal. The green
+bars include the median (50% of responses), yellow bars include the 95th
+percentile and outliers are colored red.
+