# 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 5661a
H/C 11 1.67 ± 0.05 1.42 ± 0.04 1.37 ± 0.04 1.40 ± 0.04 1.32 ± 0.04 1.66b
O/C 3 0.39 ± 0.05 0.34 ± 0.04 0.28 ± 0.03 0.32 ± 0.04 0.32 ± 0.04 0.20b
N/C 1 0.22 ± 0.01 0.14 ± 0.01 0.13 ± 0.01 0.12 ± 0.01 0.10 ± 0.01 0.03b
DBE 0 6 7 7 7 8 8b
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
1. 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.
2. aonly taking into account molecular attributions containing C, H, N, and/ O atoms.
3. bonly considering molecular attributions containing C, H, N, and/or O atoms in Murchison SOM data.