Not that anyone thought that this years NACC would yield an at large selection, but this nice NCAA published resource gives a look into the selection math, RPI style.
https://stats.ncaa.org/selection_rankings/nitty_gritties/44396?utf8=%E2%9C%93&commit=Submit
https://stats.ncaa.org/selection_rankings/nitty_gritties/44396?utf8=%E2%9C%93&commit=Submit