In the reference circuit from this [datasheet for a potentiometer][1], what is R<sub>L</sub> for?  Why did they pick 100 x R?  Bonus question, how do I pick a good value for C?

[![enter image description here][2]][2]


  [1]: https://www.mouser.com/datasheet/2/18/09-N6v03-1499128.pdf
  [2]: https://i.sstatic.net/URlBu.png