Fig. 1: Available Gibbs free energy posterior distributions inferred from simulated reflected-light observations for different Proterozoic Earth models.
From: Inferring chemical disequilibrium biosignatures for Proterozoic Earth-like exoplanets
a, Marginal posterior distribution of the log of the available Gibbs free energy for the high-abundance case, derived from SNR = 20 (hatched), 30 (unfilled) and 50 (solid fill) simulated reflected-light observations. Vertical black (dashed), orange (dotted), red (dot-dashed) and blue (solid) lines in all three panels represent the input value and previously reported values for the available Gibbs free energy of modern Earth (atmosphere only case), Mars and modern Earth (atmosphere and ocean case), respectively11. b, Same as a but for the medium-abundance case. c, Same as a but for the low-abundance case. atm, atmosphere only case; atm + oc; atmosphere and ocean case; ME, modern Earth.
