Table 1 Hydrogen, nitrogen and carbon isotopic and elemental ratios of organic matter (OM) aggregate and matrix of the Zag clast measured by NanoSIMS.

	δD ‰	δ¹⁵N ‰	δ¹³C ‰	H/C	N/C	O/C^a
OM aggregate	2,370 ± 74	696 ± 100	−43 ± 20	0.6 ± 0.1	0.022 ± 0.004	(0.06–0.07) ± 0.02
Hot spot #1	4,200 ± 550	3,413 ± 1,070		0.4 ± 0.1	0.032 ± 0.006
Hot spot #2	4,500 ± 900	724 ± 780
Matrix	—	301 ± 98	10 ± 41		0.036 ± 0.007	~1.4–1.6
CI IOM^b	972–978	30.7–31.9	−17.1 to −17.0	0.67–0.72	0.035–0.035	0.18–0.15
CM IOM (except Bells)^b	639–893	−8.5 to +7.5	−18.9 to 17.1	0.52–0.70	0.026–0.037	0.11–0.23
Bells IOM (Anomalous CM)^b	3283	415	−34.2	0.63	0.034	0.21
CR IOM^b	2,619–3,527	162–309	−26.6 to −20.3	0.69–0.81	0.032–0.044	0.11–0.22
Ordinary chondrite IOM^b	1,917–6,181	−39 to +36	−23.7 to −10.4	0.16–0.48	<0.019	0.14–0.29
Tagish Lake IOM^c	596 to 1,844	53 to 73	−14.7 to −13.3	0.34–0.72	0.041–0.043	0.13–0.26
Comets	up to ~2,200^d	~400–1200^e			0.035 ± 0.011^f

^aThe upper limits estimated by C,N,O K-edge X-ray absorption spectra. Note that N/C ratio is too low to be estimated by XANES.
^bInsoluble organic matter (IOM) data from Alexander et al.¹⁸.
^cIOM data from Herd et al.⁴² and Alexander et al.⁴¹.
^dCometary water data from Altwegg et al.³⁵ and references therein.
^eData from Marty¹⁹ and references therein.
^fData from Fray et al.²⁹.

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