(1)	$\begin{array}{l}\displaystyle p_{pc} = 756.8 -131.07 \, \gamma_g - 74 \, \gamma_g^2\end{array}$

(2)	$\begin{array}{l}\displaystyle T_{pc} = 169.2 +349.5 \, \gamma_g - 3.6 \, \gamma_g^2\end{array}$

Sutton, 1985

$\begin{array}{l}0.57< \gamma_g < 1.68\end{array}$

(3)	$\begin{array}{l}\displaystyle p_{pc} = 709.604 - 58.718 \, \gamma_g\end{array}$

(4)	$\begin{array}{l}\displaystyle T_{pc} = 170.491 +307.344 \, \gamma_g\end{array}$

Guo and Ghalambor (2005)

H₂S < 3%

N₂< 5%

Total content of inorganic compounds < 7%

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See also