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  1. or download this
    my $graph = new GD::Graph::histogram(4000000,6000000);
$graph -> set(
...
open (IMG, '>histo.png') or die $!;
binmode IMG;
print IMG $gd -> png;
  2. or download this
    Not a GD::Image object at /usr/lib/perl5/site_perl/5.8.5/GD/Graph.pm l
+ine 180