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   my $data = GD::Graph::Data->new();
   my $graph = GD::Graph::bars->new();
...
   print IMG $gd->gif;  # this is the line # 80
   if ( defined $gd ) { print " 4.gd defined\n"; } else {print " 4.gd 
+NOT defined\n"; }
   close IMG;

  use GD::Graph::Data; 
  use GD::Graph::bars; 
...
  } 
  my $chart = GD::Graph::bars->new(); 
  my $gd = $chart->plot($data);