Comparison of temperature–pressure profiles for MARCS (black solid lines) and PHOENIX(red solid lines) model atmospheres used by L2016 and L2017, and P2018 and P2019, respectively (see text for details). Each panel shows profiles for T_eff = 3200, 3400, 3600, and 3800 K (from left to right). Vertical dotted lines corresponding to the values of the effective temperatures are also shown. Three panels: profiles for three different metallicities (decreasing from the top to the bottom panel). The red dashed lines in the bottom panel correspond to PHOENIX models with [α/Fe] = +0.2 (for T_eff = 3600 and 3800 K).