use GD::Graph::lines;
my @data;
-my $graph = GD::Graph::lines->new($Statistics::GraphWidth,$Statistics::GraphHeight);
+my $graph = GD::Graph::lines->new($Statistics::GraphWidth||500,$Statistics::GraphHeight||400);
$graph->set(export_format => "png",
x_label => 'Days',
y_label => 'Average time in Days');