C1 atomic basin When reporting regional condensed values for geometric descriptors we find it useful to average these over some other regional property. Here we've averaged over (divided by) volume, resulting in units of angle per volume for 𝜅̅ , 𝜅̅ +,-, and 𝜅𝜏 OOO that give a clear sense of one volumetric region being more or less curved (i.e. less or more spherical; "atomic") or tortuous than another.