Data taken from:

Saturn:

http://lasp.colorado.edu/~espoclass/ASTR_5835_Fall-2017-Review%20Chapters-Saturn/17-Origin%20and%20Evolution%20of%20Saturn%27s%20Ring%20System.pdf

Jupiter:

https://en.wikipedia.org/wiki/Rings_of_Jupiter

Uranus:

https://en.wikipedia.org/wiki/Rings_of_Uranus

Neptune:

https://en.wikipedia.org/wiki/Rings_of_Neptune

min - inner radius km
max - outer radius (where there is none this is the center radius) km
od is optical depth
df is dust fraction %

ring_name_simp is so you don't have to type Greek letters
