Table 3.

Retention time of chemical compounds ($CI=ts/\sqrt{n},C.V=s/x$).

Compound	Retention time (min)	C.V (%)
	$\overline{x}$ ± CI(95%)
H2	1.73 ± 0.02	2.2
CO	2.85 ± 0.10	3.9
CH4	4.12 ± 0.02	1.1
CO2	15.76 ± 0.10	1.2