[3.6]−[4.5] vs. [5.8]−[8.0] diagram plotted as a two-dimensional stellar-density histogram using a binning of 0.01×0.01 and a seven-level color-coded scale such that high source densities (29 per bin) are dark green and the lowest densities (one per bin) are blue. Class II stars are drawn as magenta diamonds, and Class I objects are indicated by black points. The reddening vector for AK = 1 based on the extinction law in the direction of RCW 49 of Indebetouw et al. (2005) is shown as a filled arrow.
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