The H-Ks-band spectral index versus the de-reddened Ks-band magnitude. The individual data points are described and labeled in Fig. 8. The black dots are the logarithms of the cutoff frequencies and the black solid lines are theoretical curves α to δ explained in the text. These curves are parameterized and labeled with the logarithm of the cutoff frequency. The light blue boxes represent different flux density states using the combined data by Gillessen et al. (2006) and Hornstein et al. (2007) as described in Table 4.
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