Effect of eddy coefficient profile and 1D/2D character of the model on the vertical abundance profiles of some of the most abundant molecules in HD 209458b. We show abundances at the substellar point and at the evening and morning limbs, as given by the pseudo 2D model using the nominal eddy coefficient profile (solid lines), by the pseudo 2D model using the Moses et al. 2011’s eddy profile (dashed lines), and by a one-dimensional vertical model using the Moses et al. 2011’s eddy profile (dotted lines).