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Anyone knows what they used to render the plots?

I used ggplot2 and gganimate in R. The custom ggplot2 theme is called theme_roboto(): https://github.com/juliasilge/silgelib/blob/master/R/graphin...

Almost certainly ggplot2 in R.

The color palettes in charts with 2, 3, 4 colors are the ggplot2 defaults, and the author David Robinson has written packages that fit into the "tidyverse" of which ggplot2 is a part, so that seems quite likely.

Also, the author says in the comments that he used ggplot2 for the static plots and gganimate for the animations.

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