Yoga Korunta ref. 1.

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"Anuloma, viloma, prathiloma methods of pranayama

are described differently in Yogakoruntam. In the

anuloma method, breath instead of being taken in evenly

through the inhalation, is taken in steps; ie if for

example the duration of inhalation is interrupted after

three seconds, the breath retained for three seconds,

breath taken in for three seconds, retained for three

seconds and then breathed out evenly for six seconds. At

first the normal duration of inhalation is divided into

two steps. As practice advances the duration is

broken up into more number of equal steps intersperesed

with retention of breath". etc etc.