Fig. 4
From: Stable carbon isotope evolution of formaldehyde on early Mars
δ13C in H2CO (upper panel) as a function of H2 outgassing rate. The lower panel shows the H2CO deposition flux (blue line) and the ratio of the partial pressure of CO2 (pCO2) to the sum of the partial pressure of CO2 and CO (black line). The plotted values are taken from the 2-bar results after 600 Myr from the start of calculations under various H2 outgassing rates. All other atmospheric conditions are the same as nominal conditions.
