(Pa-Auk) Should we concentrate only on breathing through one nostril?

Hi

We have two air flows: one enters and leaves through the left nostril, the other enters and leaves through the right nostril.

It is possible to concentrate on both flows at the same time, or only on one of the flows (the one from the left nostril or the one from the right nostril).

In Pa Auk Sayadaw’s technique, I don’t understand if he advises to concentrate on both flows at the same time or on only one of the flows.

Thank you in advance

May all beings become arahant.

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