. 2017 Oct 24;7:13933. doi: 10.1038/s41598-017-14287-y

Table 2.

Gas chemistry of N₂-Ar-He and isotope compositions of the Costa Rican springs.

ID	N₂/Ar	N₂/He	He/Ar	N_2exc/He	δ¹⁵N-N₂	±	R/Ra	±	⁴He/²⁰Ne
Forearc springs
CR14-01							1.02	0.01	0.40
CR12-16	47	8,721	0.005	1,297	−0.7	0.1
CR14-02	58	2,195	0.026	676	−2.1	<0.1	0.88	0.01	0.49
CR12-15	66	5,998	0.011	2,377	−1.1	<0.1
CR14-03	49	4,267	0.011	773	−0.7	<0.1	0.61	0.01	1.37
CR14-06A	68	3,536	0.019	1,453	−2.8	0.2	0.72	0.01	5.74
CR14-06B	72	2,832	0.025	1,260
CR14-07	49	2,647	0.019	493	−1.4	<0.1	0.98	0.01	0.39
CR12-14	75	25,548	0.003	11,865	−0.9	<0.1
CR14-08	86		0.036	1,291			0.62	0.01	0.68
CR14-09	46	1,377	0.034	190	0.0	<0.1	1.06	0.01	0.40
CR14-09B	95	2,230	0.043	1,295			1.09	0.12	1.48
CR12-01	51	5,533	0.009	1,221	4.7	0.1
CR12-02	73
CR12-03	62	2,848	0.022	1,022	4.0	1.6
CR12-04	68	785,392	0.0001	320,225
Arc front springs
CR12-05	65	4,463	0.015	1,707	−0.5	0.1
CR12-06	59	4,980	0.012	1,609	−0.4	0.1
CR12-07	143	3,728	0.038	2,687	1.6	<0.1
CR12-08	116	4,285	0.027	2,808	−0.4	<0.1
CR12-09	109	3,450	0.032	2,188	−0.2	0.1
CR12-10	95	4,211	0.022	2,429	0.8	0.1
CR12-11	91	3,476	0.026	1,941	−0.4	0.1
CR12-12	64	3,618	0.018	1,356	0.1	0.3
CR12-13	30	4,722	0.006		−0.8	0.1
CR12-18	146	13,554	0.011	9,852.996	1.5	<0.1
CR12-19	68	84	0.804	34	−4.4	1.5
CR14-11	108	1,179	0.092	743	−0.2	<0.1	7.88	0.18	38.81