Table 1. Number of Monoisotopic Peaks (Unique Molecular Formulae)^a Assigned for Conifer Needle Essential Oils/Solvent Extracts with (−)ESI and (+)APPI.

sample	(−)ESI	(+)APPIb
pine oil	1513	540 (404)
spruce oil	1454	828 (571)
larch oil	1637	1487 (1017)
juniper oil	1211	602 (441)
pine toluene extract	1224	1208 (818)
pine hexane extract	1507	1011 (690)

^aMonoisotopic peaks at S/N ≥ 5.0.

^bThe peak number by counting both [M + H]⁺ and M^•+ ions. The number of unique molecular formulae are given in parentheses.