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my $property = shift || 'weight';
 
my $pt = Chemistry::PeriodicTable->new;
 
my $width  = shift || 800;
my $height = shift || 400;
 
my $chart = Chart::Lines->new($width, $height);
 
$chart->set(
    legend       => 'none',
    title        => "$property per element",
    x_label      => 'Element',
    y_label      => 'Value',
    include_zero => 'true',
    precision    => 2,
    skip_x_ticks => 4,
    brush_size   => 2,
    pt_size      => 4,
    y_grid_lines => 'true',
);