Manasara 18.96

18.96

tuṅge ṣaḍbhāgavistāre saptāṃśaṃ kāśyapī tathā
tuṅge pañcāṃśa ṣaḍbhāgaṃ vyāsa kṣauṇiriti smṛtam

with six parts in height and seven parts in width, it is Kāśyapī;
with five parts in height and six parts in width, it is remembered as Kṣauṇī;