R (>= 2.14.0), methods, graphics, grid, ggplot2
R (>= 2.14.0), methods, graphics, grid, ggplot2, gridExtra
R (>= 3.0.0), methods, graphics, grid, ggplot2, gridExtra
R (>= 3.0.0), methods, graphics, grid, ggplot2, gridExtra,
reshape2