WIP - adding..
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https://CRAN.R-project.org/package=ggforce.
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https://CRAN.R-project.org/package=ggalt.
Sjoberg, David. 2020. 
Ggbump: Bump Chart and Sigmoid Curves. 
https://CRAN.R-project.org/package=ggbump.
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https://ggplot2.tidyverse.org.
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https://CRAN.R-project.org/package=ggridges.