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=item dclrs (short for datacolours)
...

    $graph->set( dclrs => [ qw(green pink blue cyan) ] );
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        _rgb($self->{dclrs}[$_[0] % @{$self->{dclrs}} - 1]);
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    add_colour(colourname => [$r, $g, $b]) or add_colour('#7fe310')

Self-explanatory. Exported with the :colours tag.