J − H versus H − K color−color diagram as in Fig. 2 (the same symbols are used), but corrected for the secular brightening. The dashed gray curve a) traces the expected colors of a blackbody reddened by E(J − H) = 0 mag and E(H − K) = 0.863 mag; the dotted black curve b) shows a blackbody reddened by E(J − H) = 0.4 mag and E(H − K) = 1.2 mag (see text). The temperature steps, indicated with open squares along the blackbody functions, are 100 K between 2000–3000 K and 1000 K for higher temperatures.
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