Manasara 16.50

16.50

tribhāgaṃ cottarottuṅgamūrdhve aṃśena vājanam
tadūrdhve padmatuṅgaṃ syādvājanaṃ caikabhāgikam

the height of the architrave is three parts, and above is a fillet with one part; / above that is the height of the lotus, and a fillet of one part;