Table 1 Data summary of FT-ICR analyses.

Samples	Ice	Pre-accretion	Post-aqueous				Murchison
Duration	0	5	1	10	30	100	-
Attributions	3	3964	3808	2301	2746	3424	5661^a
H/C	11	1.67 ± 0.05	1.42 ± 0.04	1.37 ± 0.04	1.40 ± 0.04	1.32 ± 0.04	1.66^b
O/C	3	0.39 ± 0.05	0.34 ± 0.04	0.28 ± 0.03	0.32 ± 0.04	0.32 ± 0.04	0.20^b
N/C	1	0.22 ± 0.01	0.14 ± 0.01	0.13 ± 0.01	0.12 ± 0.01	0.10 ± 0.01	0.03^b
DBE	0	6	7	7	7	8	8^b
CHNO	-	3512	2739	1836	2268	2591	3796
H/C	-	1.72 ± 0.05	1.45 ± 0.04	1.38 ± 0.04	1.40 ± 0.04	1.34 ± 0.04	1.45
O/C	-	0.40 ± 0.05	0.35 ± 0.04	0.27 ± 0.03	0.31 ± 0.04	0.32 ± 0.04	0.32
N/C	-	0.16 ± 0.01	0.12 ± 0.01	0.11 ± 0.01	0.11 ± 0.01	0.10 ± 0.01	0.06
CHO	-	351	1021	407	472	771	1684
H/C	-	1.39 ± 0.04	1.32 ± 0.04	1.29 ± 0.04	1.41 ± 0.04	1.26 ± 0.04	1.81
O/C	-	0.25 ± 0.03	0.33 ± 0.04	0.36 ± 0.04	0.42 ± 0.05	0.33 ± 0.04	0.14
CHN	-	63	22	28	6	15	165
H/C	-	0.94 ± 0.03	0.72 ± 0.04	1.20 ± 0.07	1.36 ± 0.08	1.10 ± 0.03	1.61
N/C	-	0.089 ± 0.005	0.055 ± 0.003	0.15 ± 0.01	0.26 ± 0.02	0.13 ± 0.01	0.11

Numbers of molecular attributions, average elemental ratios, average double bond equivalent (DBE), and number of molecular attributions per families for the different samples, initial ice, pre-accretional organic residue, and post-aqueous organic products after 1, 10, 30, and 100 days of aqueous alteration at 150 °C compared to Murchison SOM. Elemental ratios are weighted by ion intensities. Errors for elemental ratio of residues are extrapolated from the data in Fresneau et al. 2017²⁸ assuming no difference between FT-Orbitrap-MS and FT-ICR-MS analyses since for same residues similar elemental ratio are obtained.
^aonly taking into account molecular attributions containing C, H, N, and/ O atoms.
^bonly considering molecular attributions containing C, H, N, and/or O atoms in Murchison SOM data.

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