In a published book I've seen a nice set of facial expressions, with a small (half dozen?) set of "eigenemotions", then the matrix of combinations of the eigene

In a published book I've seen a nice set of facial expressions, with a small (half dozen?) set of "eigenemotions", then the matrix of combinations of the eigenemotions to express more nuanced emotions. Anyone know of a publicly-accessible image in this genre? (Laumer's Corps Diplomatique Terrestrienne[sic] has gone so far as to give each facial expression an official alphanumeric code, but I doubt he bothered to substructure, or even hold consistent, the coding scheme)