[Commentary:] 81) One who performs Omkar Kriya with utterance - meaning performing pranayam from the door at the region of the anus to the eyebrows - he can see the Face in Kutastha.
Making vayu like a rope from the throat to the eyebrows - "kua" [well] - meaning throat, heart, navel, lingamula, Muladhar - all the lotuses that are there in these five elements - draw vayu through the roadway of this tube, bring it into the middle of the eyebrows - meaning: into the Ajna chakra and merge there. vs.22
Pratyahar happens with 12 pranayams; dhyan with 1728 pranayams - the Stillness from the pulling and dropping of pranayam; dharana with 144 pranayams - "tarka" [enquiring and concluding] is in the Yoni - taking vayu in Tranquility to the middle of the eyebrows and discerning in the Lord in the head is called "tarka." "Samadhi" - 20,736 pranayams is called [leads to] "samadhi." This is what is called "sharanga yoga" [six-limbed yoga].