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### ======================================================
### UTIL: plot (using GD::Graph::$type)
...
    binmode IMG;
    print IMG $gd->png;
}

### ------------------------------------------------------
### Plot SDPI-$y-$mm-Load-($avg[0],$avg[1])
...
$opt{title} .= '-';                         # Fixed
$opt{y_max_value} = $opt{y_tick_number} = 40;
plot(\%opt, \@data, 'lp', 400);