Madhya nāḍī (madhya nāḍī means, the central vein), the central vein suṣumnā, which is madhya saṁsthā, situated in the central path, and this madhya nāḍī should be concentrated [upon] just like taking
not yet formally done — never invented
attention-seat: madhya-nāḍī · do: central channel thin as a lotus stalk, interior; deva shines