const RIM_INNER: 0.7
Where the rim crest sits and how far the raised rim spreads, in crater radii.
The crest is at the rim — t = 1 — with the raised material running from
0.7 to 1.5. Measured lunar profiles put the crest within a few percent of the
rim radius and the flank out to about 1.5, which is where the continuous
ejecta deposit starts.