Table 3 Volatile content of selected samples measured by gas chromatography (in nanomoles).

CO₂

CH₄

C₂H₆

C₃H₈

n-C₄H₁₀

n-C₅H₁₂

"N₂"*

H₂O**

Mol fraction of species excluding H₂O

${\text{X}}_{{\text{C}}_2{\text{H}}_6}$

${\text{X}}_{{\text{C}}_3{\text{H}}_8}$

${\text{X}}_{{\text{n-C}}_4{\text{H}}_{10}}$

${\text{X}}_{{\text{n-C}}_5{\text{H}}_{12}}$

${\text{X}}_{"{\text{N}}_2"}$