Table 3.

Homologous series of moderately volatile organic compounds detected in the hot springs supporting microbial life (first number) and sterile condensate of water–steam mixtures from wells (second number) (adapt from [8]).

Homologous Series	Compounds in Springs/in Wells
Alkanes	21/21
Isoalkanes	17/7
Isoprenes	0/2
Cycloalkanes (naphthenes)	2/0
Alkenes	7/0
Aromatic hydrocarbons	13/26
Halogenated aromatic hydrocarbons	9/2
Alcohols	5/4
Aldehydes	4/2
Ketones	3/2
Carboxylic acid	14/1
Esters	11/0
Steroids	3/0
Terpenes	1/1
Lactams	1/0
Sulfur-containing hydrocarbons	0/1