Comparison of distance moduli (left panel), reddenings (middle panel), and ages (right panel) derived with literature data. Optical data (Loktin et al. 2001; Loktin 2004, priv. comm.) are shown by red circles, the NIR data are marked by blue crosses (Froebrich et al. 2010) and green plusses (Bukowiecki et al. 2011). The dotted lines labelled L (Loktin), F (Froebrich), and B (Bukowiecki) are the corresponding fitted linear regressions (see Table 3 for their parameters).