[R] Adding a legend to a (multi-facet) plot produced by ggplot().

[Jeffrey Pullin]

Hi Rolf,

Some code to produce the plot you want is here:

https://gist.github.com/jeffreypullin/be752f11a136601ffecddc73ba0519b9

Hope you find it helpful.

Personally I have found that the key to effective ggplot2 use is getting
your data into the right format (one data.frame, tidy style) before you plot
it.

Cheers
Jeffrey

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