+=item B<-g> B<none>|B<prettyping>|B<boxplot>|B<histogram>
+
+I<noping only> Selects the graph to display.
+
+=over 4
+
+=item B<none>
+
+Do not show a graph.
+
+=item B<prettyping>
+
+Show a graph with time on the x-axis, the y-axis shows the round-trip time.
+This is the default graph.
+
+If your terminal supports unicode and colors, they are used to improve
+the precision of the data shown: a green box is drawn for round-trip times up
+to one third of the configured timeout, the height representing the RTT. Longer
+RTTs will start to fill the box yellow (with a green background) and then red
+(with a yellow background). Lost packages are drawn as a bold red explamation
+mark.
+
+=item B<boxplot>
+
+Show a I<box plot> where the x-axis, i.e. the width of the window, is the
+round-trip time. The entire width of the window it the ping interval, set with
+the B<-i> option.
+
+The box is sized so it contains 50% of the replies. The vertical line shows the
+median. The whiskers are sized to contain 95% of the replies -- 2.5% below the
+whiskers and 2.5% above.
+
+ |----------[#####|##########]--------------------------------------------|
+ ^ ^ ^ ^ ^
+ 2.5% 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 80th
+percentile, yellow up to and including the 95th percentile and red for the
+remainder.
+
+=back
+
+=item B<-b>
+
+Audible bell. Print a ASCII BEL character (\a or 0x07) when a packet
+is received before the timeout occurs. This can be useful in order to
+monitory hosts' connectivity without looking physically at the
+console, for example to trace network cables (start audible beep,
+disconnect cable N: if beep stops, the cable was in use) or to tell
+when a host returns from a reboot.
+
+This relies on the terminal bell to be functional. To enable the
+terminal bell, use the following instructions.
+
+=over 4
+
+=item
+
+the visual bell is disabled in your terminal emulator, with the +vb
+commandline flag or the following in your .Xresources:
+
+ XTerm*visualBell: false
+
+=item
+
+the PC speaker module is loaded in your kernel:
+
+ modprobe pcspkr
+
+=item
+
+X11 has the terminal bell enabled:
+
+ xset b on; xset b 100
+
+=item
+
+and finally, if you are using PulseAudio, that the module-x11-bell
+module is loaded with a pre-loaded sample defined in your pulseaudio
+configuration:
+
+ load-sample-lazy x11-bell /usr/share/sounds/freedesktop/stereo/complete.oga
+ load-module module-x11-bell sample=x11-bell
+
+=back
+