(K − A) near- to mid-IR colour indice versus Mbol for IRAS 1835−06 and members of Ste2 (following Davies et al. 2007a). Errors in Mbol for IRAS 1835-06 are dominated by uncertainty in reddening and the value is for an assumed distance of ~6 kpc. Individual errors for Ste2 members are not presented by Davies et al. (2007a, their Fig. 10) but appear to be ≲0.25 mag in Mbol and of order the symbol size in (K − A). In the absence of an IR excess we would expect a star to reside at (K − A) ~ 0.
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