2.13.1.1 Low pO₂ i.e. oxygen deficit

At large oxygen deficit, we can assume that

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(2.55)

Thus from (2.50)

(2.56)

Substituting in (2.53)

(2.57)

And from (2.52)

(2.58)

Combining (2.56)-(2.58) and using (2.55), we get the following condition

(2.59)