Excluding external contacts, placing the gaze between the eyebrows, equalizing prāṇa and apāna that move in the nasal cavities…

Pratyāhāra technique. Sparśān kṛtvā bahiḥ — making contacts external — indicates pratyāhāra, withdrawal of senses.

Cakṣuḥ antare bhruvoḥ — the gaze between the eyebrows — is śambhavi mudrā, point of concentration (ājñā cakra). Prāṇāpānau samau kṛtvā — equalizing prāṇa and apāna — is balance of vital and eliminative energies, basis of kuṇḍalinī. Nāsābhyantara-cāriṇau — that move in the nasal cavities — indicates awareness of breath. Three levels: sensory, visual, energetic.