GD::Graph - how to get rid of leading gap in line graph?

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Is there a way to get rid of the leading gap to the left of a line
graph?  Therefore, I want the graph line to start on the Y-axis, not
the position of the first X tick.  Or, make the first X tick be
located on the Y-axis.

Here is a simple example:

use strict;
use GD;
use GD::Graph::lines;

my @months = ( "Jan", "Feb", "Mar", "Apr", "May", "Jun",
               "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" );
my @rainfall = ( 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 );
my @array = (\@months, \@rainfall);

my $graph = new GD::Graph::lines(768, 896);
$graph->set( y_long_ticks => "1", x_tick_offset => "2" );

my $gd_image = $graph->plot( \@array );
open(IMG, ">./test.png") or die $!;
  binmode IMG;
  print IMG $gd_image->png;

exit 0;

This graph will have a gap between the Y-axis and the first X tick

Thanks in advance for your help.

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