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$width=$xaxiss[0];
$height=$xaxiss[$#xaxiss];
...
    dclrs       => ['green'] ,
    BACKGROUND='black',
   ) or warn $mygraph->error;

---newcode--
$mygraph->set_x_label_font(GD::gdGiantFont);
$mygraph->set_y_label_font(GD::gdGiantFont);