Description of the 1D atmospheric model. Each module of the model is shown with its role and the parameters needed for the simulations. Using iterations between VULCAN and HELIOS following the radiative timescale, the model performs self-consistent calculations of atmospheric chemistry and radiative transfer. The different model parameters mentioned are melt temperature T_m, melt oxygen fugacity fo₂, activity of graphite A_c, degassing pressure assumed similar to surface pressure P_s, vertical profile of temperature T_atm and pressure P_atm in the atmosphere, eddy mixing coefficient K_zz and vertical profile of volume mixing ratio X_i for each species i.