Just gave it a go and it worked perfectly. It's worth noting that when run from the browser the output in error.log is the SVG file (or PNG if I change format) and the data is correct. It just seems gnuplot is sending the output to the wrong place.

In reply to Re^2: Chart::GnuPlot output goes to apache error.log by AndrewHolding
in thread Chart::GnuPlot output goes to apache error.log by AndrewHolding

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