Helpful ggplot references
base colors:
* https://www.statology.org/ggplot-default-colors/#:~:text=By%20default%2C%20ggplot2%20chooses%20to,and%20blue%20for%20the%20bars.
Changing individual points in a legend
https://stackoverflow.com/questions/25007324/can-ggplot2-control-point-size-and-line-size-lineweight-separately-in-one-lege