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association scheme variables Na, Nb, Nc

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hi, i have a question regarding association scheme variables Na, Nb, Nc:

from "rehner2020.json", water _2B, _3B and _4C, I understand that NA is the number of electron accepting sites (~H) and NB is the number of electron donating sites ( ~O: ), but what is the NC field (currently set to default zero)?

rehner2020_water4c

as I understand, all interactions are calculated from a single couple of parameters for each molecule (kappa_ab and epsilon_k_ab) and these sites numbers and its intrinsic characteristics.

thanks,

iuri.

Hi Iuri,

@prehner created a nice representation here. Does that help?

Great, I'm closing this issue. We can open it again if new questions come up.