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    my $format = $my_graph->export_format;

print header("image/$format");
binmode STDOUT;
print $my_graph->plot(\@data)->$format();
  2. or download this
    Can't call method "gif" on an undefined value at C:/Apache/Apache2/cgi
+-bin/histogram.pl line 86, <fh00001miniproject620.txt> line 113.