Comparison of the new PHOENIX models (grey) to four stars with known temperature and surface gravity (colour; from top to bottom: GJ411, GJ551, GJ667C, and GJ699). The new models provide a substantial improvement over the old model generation (see Reiners 2005). In particular, the two TiO bands yield consistent results, although there might still be some problems fitting the K- and Na-lines (e.g. see spectrum of GJ551 and GJ699). The data were not corrected for absorption lines from Earth’s atmosphere, therefore many sharp lines seen in the observations are not captured by the models. These lines were not included in the fit.