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  1. or download this
    $chart->plot2d($h1, $h2, $h3...)
  2. or download this
    #!/usr/bin/perl
use Chart::Gnuplot; 
...

$chart->plot2d(\@all_vars);
  3. or download this
    Not a HASH reference at /usr/local/share/perl/5.14.2/Chart/Gnuplot.pm