Table 1.

List of key parameters for the model calculations.

	C	N	H	C/N	C/H
BSE [μg/g-Earth]	42–730${}^{\mathrm{a},\mathrm{b},\mathrm{c}}$	0.83–2.5${}^{\mathrm{a},\mathrm{b},\mathrm{c}}$	44–450${}^{\mathrm{a},\mathrm{b},\mathrm{c}}$	40 ± 8${}^{\mathrm{a},\mathrm{d}}$	1.3 ± 0.3 ${}^{\mathrm{a},\mathrm{e}}$
CI chondrites [ppm]	20,000–50,000${}^{\mathrm{f}}$	500–2,000${}^{\mathrm{f}}$	4,700–10,500${}^{\mathrm{g}}$	14.5 ± 2.5${}^{\mathrm{d}}$	2–8${}^{\mathrm{h}}$
CI model [ppm]	35,000	1,500	6,900	23	5
Enstatite chondrites [ppm]	2,000–7,000${}^{\mathrm{f}}$	100–500${}^{\mathrm{f}}$	90–600${}^{\mathrm{i}}$	13.7± 12.1${}^{\mathrm{d}}$
EC model [ppm]	4,000	250	400	16	10
Oxidised model
$S_{\mathrm{i}}$	1.6${}^{\mathrm{j},\mathrm{k}}$	1.0${}^{\mathrm{l}}$	M98 model${}^{\mathrm{m}}$
$D_{\mathrm{i}}^{\mathrm{met}/\mathrm{sil}}$	500${}^{\mathrm{n},\mathrm{o}}$	20${}^{\mathrm{p}}$	6.5${}^{\mathrm{q}}$
Intermediate model
$S_{\mathrm{i}}$	0.55${}^{\mathrm{o}}$	5.0${}^{\mathrm{p}}$	M98${\text{model}}^{\mathrm{l}}$
$D_{\mathrm{i}}^{\mathrm{met}/\mathrm{sil}}$	1000${}^{\mathrm{n},\mathrm{o}}$	20${}^{\mathrm{p}}$	6.5${}^{\mathrm{q}}$
Reduced model
$S_{\mathrm{i}}$	0.22${}^{\mathrm{r}}$	50${}^{\mathrm{l}}$	5.0${}^{\mathrm{s}}$
$D_{\mathrm{i}}^{\mathrm{met}/\mathrm{sil}}$	3,000${}^{\mathrm{n},\mathrm{o}}$	20${}^{\mathrm{p}}$	6.5${}^{\mathrm{q}}$

Observational data and model reference values for the abundances of C, N, and H in the bulk silicate Earth (BSE) and chondrites (assumed as building blocks, CI chondrites and enstatite chondrites). We set CI chondritic model, solubilities $S_{\mathrm{i}}$ (the units are ${(P_{\mathrm{i}}/1\mathrm{MPa})}^{1/2}\mathrm{ppm}$ for reduced $S_{\mathrm{H}}$ and $\left(P_{\mathrm{i}},/,1\mathrm{MPa}\right)\mathrm{ppm}$ for the others, where $P_{\mathrm{i}}$ is the partial pressure of each molecule $\mathrm{i}$), and the partitioning coefficients $D_{\mathrm{i}}$ under each redox state by following Hirschmann⁵. (a) Hirschmann⁵, (b) Marty⁴, (c) Hirschmann¹⁷, (d) Bergin et al.¹⁵, (e) Hirschmann and Dasgupta¹²⁴, (f) Grady and Wright⁸¹, (g) Vacher et al.⁸², (h) Kerridge⁷⁹, (i) Piani et al.⁸⁴, (j) Stolper and Holloway¹²³, (k) Pan et al.²⁰, (l) Libourel et al.¹¹⁴, (m) Moore et al.¹⁹, (n) Chi et al.¹⁰⁰, (o) Armstrong et al.¹⁰¹, (p) Roskosz et al.¹⁰³, (q) Okuchi¹⁰², (r) Wetzel et al.¹¹², (s) Hirschmann et al.⁶⁷.