Comparison of the classical 2008 MARCS model at the lower boundary of the 2008 grid (labeled ‘G2008-MARCS’) with models computed with the MSG code and based on various levels of completeness and choices of input data as described in the text. Models labeled ‘MSG 22…mol..’ are based on molecular opacities from the 22 molecules included in the DRIFT-MARCS computations, while models labeled ‘MSG 16mol…’ are based on opacities from the 16 molecules included in the classical MARCS grid. Upper panel show the T–Pg structure of the full models from log(τ_ross) = –5.0 to +2.5 while the lower panel zooms in on the upper part of the atmosphere.