Colonne:
gruppo : 1 = Microtus multiplex; 2 = M. subterraneum; 0: unknown.
Y1 = width of upper left molar 1 (M1LEFT)
Y2 = width of upper left molar 2 (M2LEFT)
Y3 = width of upper left molar 3 (M3LEFT)
Y4 = length of incisive foramen (FORAMEN)
Y5 = length of palatal bone (PBONE)
Y6 = condylo incisive length or skull length (LENGTH)
Y7 = skull height above bullae (HEIGHT)
Y8 = skull width across rostrum (ROSTRUM)
