Teff predictions obtained from the ellipsoidal samplings (BT-Settl) for the four empirical libraries of ground-based spectra. The colour code is the same as used in Fig. 8. The x-axis shows the spectral types gathered from the literature cited in the spectral compilations. The grey line shows the Teff-spectral type calibration by Stephens et al. (2009) from optical and infrared spectra (± 250 K, grey dashed lines). The right-hand panels show the residuals with respect to the calibration as in Fig. 8. The top row corresponds to the spectra simulated at G = 15 and the bottom row corresponds to the G = 20 replicates.
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