Control the aesthetics in R

http://docs.ggplot2.org/current/guide_legend.html

http://docs.ggplot2.org/current/theme.html

http://stackoverflow.com/questions/16356052/control-ggplot2-legend-look-without-affecting-the-plot

http://stackoverflow.com/questions/3932038/plot-a-legend-outside-of-the-plotting-area-in-base-graphics