tt Monospace font
u Underline
-More details on L<http://developer.gnome.org/doc/API/2.0/pango/PangoMarkupFormat.html>.
+More details on L<http://developer.gnome.org/pango/stable/PangoMarkupFormat.html>.
[B<-G>|B<--graph-render-mode> {B<normal>,B<mono>}]