By default the format of the axis labels gets determined automatically. If
you want to do this your self, use this option with the same %lf arguments
-you know from the PRING and GPRINT commands.
+you know from the PRINT and GPRINT commands.
=head2 Legend
B<VDEF:>I<vname>B<=>I<RPN expression>
-You need at least one B<DEF> statement to generate anything. The
-other statements are useful but optional.
+You need at least one B<DEF> and one B<LINE>, B<AREA>, B<GPRINT>, B<PRINT>
+statement to generate anything useful.
+
See L<rrdgraph_data> and L<rrdgraph_rpn> for the exact format.
NOTE: B<Graph and print elements>