Fig. 11
A histogram showing the distribution of spectral slope (α) for the sources with valid fluxes in the 2MASS and AKARI/IRC catalogues for the entire one-square-degree field. Slopes derived using K to 9 μm photometry and K to 18 μm data are plotted separately using filled and hatched histogram bars, respectively. Protostellar classifications are also indicated following Greene et al. (1994) and Evans et al. (2009).
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