stats, plot3D, ggplot2, reshape2, grid, ggthemes, tidyr,
statebins, ggrepel, RColorBrewer, scales, gridExtra, parallel
knitr, rmarkdown, stringr, ggplot2, testthat (>= 3.0.0)
knitr, rmarkdown, stringr, testthat (>= 3.0.0), lintr, zoo,
graphics,