"{viridis} is an R package that presents colour-blind friendly palettes. It improves the graph readability. The advantage of {viridis} is that the palettes are perceptually uniform, easy to print in greyscale and colour-blind friendly. To use the {viridis} in ggplot2 simply ass:
π scale_colour_d()
In the slope graphs I generated in this example, I simply added the function above. The image shows four possible {viridis} palettes. #rstats#accessibility#ggplot2#dataviz
@janeadams Thanks for your comment, and it could run the risk of misinterpretation by the readers. Also, these plots show only the palette without any real context and information for the reader. I don't use {viridis} palette for categorical data. But, I was curious to see the effect on this kind of data and if it could be used it.