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Could you elaborate further and give a source of this information, please?

Hi Aloka,
In the section on "Jhana," Ajaan Lee gives a standard explanation in his book Keeping the Breath In Mind:

4. The fourth jhana.... The breath property is absolutely quiet, free from ripples, crosscurrents, and gaps.... The breath, which forms the present, is still, like the ocean or air when they are free from currents or waves.... The mind is neutral and still; the breath, neutral and still; past, present, and future are all neutral and still. This is true singleness of preoccupation, focused on the unperturbed stillness of the breath. All parts of the breath in the body connect so that you can breathe through every pore. You don't have to breathe through the nostrils, because the in-and-out breath and the other aspects of the breath in the body form a single, unified whole.... http://www.accesstoinsight.org/lib/t...ind.html#jhana Ajaan Geoff (Thanissaro Bhikkhu) and Gil Fronsdal also speak of it frequently when they teach anapanasati.
May you feel safe.
bucky