use GD::Graph::bars;
@data = ( 
    ["1st","2nd","3rd","4th","5th","6th","7th", "8th", "9th"],
    [    5,   12,   24,   33,   19,    8,    6,    15,    21],
    [    1,    2,    5,    6,    3,  1.5,    1,     3,     4]
);

$my_graph = new GD::Graph::bars( );
$my_graph->set( 
        x_label => 'X Label',
        y1_label => 'Y1 label',
        y2_label => 'Y2 label',
        title => 'Using two axes',
        y1_max_value => 40,
        y2_max_value => 8,
        y_tick_number => 8,
        y_label_skip => 2,
        long_ticks => 1,
        two_axes => 1,
        legend_placement => 'RT',
        x_labels_vertical => 1,
        x_label_position => 1/2,

        bar_spacing => 2,

        logo => 'frog.png',
        logo_position => 'BR',
);

$my_graph->set_legend( 'left axis', 'right axis');
my $gd = $my_graph->plot(\@data);