Manasara 14.93

14.93

dviṃśaṃ cāntaritaṃ cordhve pratiṃ caikāṃśameva ca
tadūrdhve vājanaṃ cāṃśaṃ śeṣaṃ prāguktavannayet

And the recess above is two parts, and the counter-course is just one part; / above that, the fillet is one part; one should execute the remainder as stated before.