plotrix (>= 3.6-3), grDevices, graphics, utils
plotrix (>= 3.6-3), grDevices, graphics, utils, RColorBrewer
qtl (>= 1.39-5), plotrix (>= 3.6-3), grDevices, graphics,
utils, RColorBrewer
qtl (>= 1.39-5), rmarkdown, testthat, knitr