Legend for a continuous color scale in R, from https://aurelienmadouasse.wordpress.com/2012/01/13/legend-for-a-continuous-color-scale-in-r/
1  | legend.col(col = rainbow(100), lev)
 | 
col | 
 ccol Color map (default is rainbow).  | 
lev | 
 Data used to produce colors in plot.  | 
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