Inhale through the nose (both nostrils) and exhale through the mouth (NM).
An alternative pattern, inhaling and exhaling through the nose (NN), requires more discipline and would be more appropriate for an inward orientation.
To the All-Pervading life in space.
A ray or stream of light is formed by the exhalation. This may be directed towards a visualized target, such as some sacred symbol or projected towards the infinite.