Add Two-Headed Arrow as Legend

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Shouro Dasgupta

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Apr 9, 2016, 10:41:01 AM4/9/16
to rworldmap
If this is my command to plot a map of Europe:

eps_europe <- mapCountryData(n, nameColumnToPlot="eps_score", mapTitle="EPS Score - Europe",colourPalette=colourPalette, 
                             catMethod="fixedWidth", missingCountryCol = "white", mapRegion="Europe", addLegend=FALSE)

Instead of adding numeric based legend, I would like to add a two-headed arrow with some text. I would be grateful for any help. Thank you!

Sincerely,

Shouro
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