in reply to Chart::Gnuplot Frogs and Temperatures vs date

INCORRECT - see Re: Chart::Gnuplot Frogs and Temperatures vs date below

I think you need to use 'multiplot', something to the effect of:

$chart1(yrange => [0,400] ...)

$chart2(y2range => [-5,20] ...)

$chart->multiplot($chart1, $chart2)

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