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#!/usr/bin/perl -w
use strict;
...
my $graph = new GD::Graph::hbars(400,425);
$graph->set(x_labels_vertical =>0, valign => '1', x_label_skip =>2);
$graph->plot(\@data) or die $graph->error;

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roboticus@B001C23219B6C /Work/Perl/PerlMonks  [11:03:17]
$ ./789153.pl 
No attribute 'valign'
Invalid data set: 0
         at ./789153.pl line 13.