converged above T$_{\rm eff}$ = 5000K. Convergence problems are visible only in the outermost layers for stars with T$_{\rm eff} <$ 5000K. The regions affected by convergence issues are limited to log $\tau_{\rm Ross} < -$4. However, these un-converged layers on the top of the atmosphere at low temperatures do not affect most line profiles very significantly, because most lines form deeper in the atmosphere. A little over a million ATLAS9 atmospheres were calculated.

Over 20,000 MARCS fully converged models with ranges in \[C/M\] and \[$\alpha$/M\] have been produced. Models are available in spherical and plane-parallel cases. Convergence issues are also present for red dwarf stars, similarly to the ATLAS9 models.

Examples were presented for both ATLAS9 and MARCS models for T$_{\rm eff} = 4000$K and 5500K, and compared to the Castelli-Kurucz grid. The new ATLAS9 and MARCS models agree well for all temperatures, while the differences between these calculations and the Castelli-Kurucz grid arise from the updated abundance tables. We briefly illustrated the effects of decreased/increased carbon and $\alpha$ content on the structure of the atmospheres, which are very similar in the MARCS and ATLAS9 models. The response to the carbon content is only different in the outermost layers 