Table 2. List of standard compounds.

Group	Compound	Retention time (RT)	Ionization mode (EI+)
Isoprene (ISO)	Isoprene	6.43	67+68+53
Monoterpene (MT)	α-Pinene	21.65	93+136
	Camphene	22.38	93+136
	Sabinene	23.04	93+136
	Myrcene	23.28	69+93
	β-Pinene	23.4	69+93
	β-Phellanderene	24.24	93+136
	3-Carene	24.39	136
	α-Terpinene	24.59	93+121+136
	Limonene	25.05	68+93
	r-Terpinene	25.98	93+136
	Terpinolene	26.99	93+121+136
	Cymene	24.84	119+134
	Ocimene	28.04	105+121+136
Oxygenated Monoterpene (OMT)	Camphor	29.36	81+95+108
	Terpineol	30.57	59+93+136
	Eucalyptol	25.28	93+139+154
	Borneol	29.87	95+110+139
	Menthol	30	81+138
	Sabinene hydrate	28.46	93+121+136
	Linalool	27.08	93+121+136
	D-Fenchone	27.28	69+81
	Fenchyl alcohol	28.28	81+111+121
	Isopulegol	29.17	121+136+154
	Nerol	31.14	41+69+93
	Pulegone	31.98	81+109+152
	Geraniol	31.79	69+41
Sesquiterpene (ST)	Caryophyllene	37.47	133+175
	α-Cedrene	37.59	119+161
	α-Humulene	38.5	80+93+147
	Farnesene	39.2	69+93+161
	Valencene	39.36	161+189+204
Oxygenated Sesquiterpene (OST)	cis-Nerolidol	39.51	69+93+161
	trans-Nerolidol	40.35	69+161+189
	Caryophyllene oxide	41.92	79+93+121
	Guaiol	42.15	161+189+204
	Cedrol	43.23	95+150
	α-Bisabolol	44.71	93+109+119