$mygraph->set( dclrs => [ "colour1" , "colour2" , "colour3" , "colour4" , "colour5" , "colour6" , "colour7" , "colour8" , "colour9" , "colour10" ] );
my $myimage = $mygraph->plot(\@data) or die $mygraph->error;
$mygraph->set( dclrs => [ "colour1" , "colour2" , "colour3" , "colour4" , "colour5" , "colour6" , "colour7" , "colour8" , "colour9" , "colour10" ] );
my $myimage = $mygraph->plot(\@data) or die $mygraph->error;