Vertical profiles of temperature (a) and $f_{{\mathrm{O}}_2}$ (noted as the log-unit difference from the IW buffer), (b) through the MO for all M_p and Φ, for ΔIW_eq = −2. The thick dashed and dotted black lines in panel a correspond to the solidus from Fiquet et al. (2010; used for Earth and sub-Earth-mass planets), and the solidus from Stixrude (2014; used for super-Earth-mass planets), respectively. The solidus defines the temperature reached at the bottom of the MO. The thin dotted black line corresponds to the maximum pressure in panel b. The solid vertical line in panel b corresponds to ΔIW_eq = −2, which is the value reached at the bottom of the MO. The profile of ΔIW for cases with ΔIW_eq = 0 (ΔIW_eq = −5) are offset by 2 (−3) log-units on the x-axis of panel b.