Yājñavalkya Śikṣā 52

52

svarite tryaṅgulaṃ vindyānnipāte tu ṣaḍaṅgulam
utthāne tu jātyasya hastasyānupathasya ca

For the circumflex accent, one should know three finger-breadths, but six finger-breadths on the descent; / and in the ascent of the natural circumflex, and of the following movement of the hand,