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Nicer scatter plots in GGgally ggpairs-ggduo

GGally is an extension of ggplot2. I use it mainly as a replacement/refinement of pairs in base R. Here, I want to replace the default scatter plot used to compare 2 continuous variables with something nicer, especially adapted to plotting large number of points. Load the library and some RNA-seq data: library(GGally) library(airway) data(airway) The airway dataset contains data for 4 cell lines treated or not with dexamethasone: