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        title       		=> ($params{'-title'}   || q/Evolution/ ),
        x_label     		=> ($params{'-x_label'} || q/Generation/),
        y_label     		=> ($params{'-y_label'} || q/Value/     ),
        
        ( $params{-logo} && -f $params{-logo} ? ( logo => $params{-logo} ) : ( ) )
    );
	
	
    my $gd = $graph->plot( [ [ 0..$#{$data->[0]} ], @$data ] ) or croak($@);
    open(my $fh, '>', $params{-filename}) or croak($@);
    binmode $fh;
    print $fh $gd->png;
    close $fh;
    
    return 1;
}
#=======================================================================
# TRANSLATIONS #########################################################
#=======================================================================
sub as_array_def_only {
	my ($self, $chromosome) = @_;