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    मध्यनाडी मध्यसंस्था विससूत्राभरूपया । ध्यातान्तर्योमया देव्या तया देवः प्रकाशते ॥ ३५ ॥

    One should meditate on the inner space of the medial nadi (sushumna) situated in the central axis of the body (the spinal column), which is as slender as a fibre of the lotus stem, and then by the grace of Devi, the divine (form) is revealed.