Manasara 45.52

45.52

tatsame nimnavṛttaṃ ca kampaṃ kuryāttadūrdhvake
dvyaṃśena galakaṃ cordhve cāṃśena kampavṛttakam

equal to that is a concave molding (nimnavṛtta), and above that one should make a fillet (kampa); / the neck is two parts, and above it a rounded fillet of one part;