Fig. 6
Near-infrared colour−colour diagram based on 2MASS data showing all the Hα emitters in M 42 with 2MASS detections in all the three bands (JHKs), except upper limits. Main-sequence and giant loci from Bessell & Brett (1988), corrected to the 2MASS photometric system (Carpenter et al. 2001) and the extinction law from Rieke & Lebofsky (1985), are represented in the figure. Symbols as defined in Fig. 3.
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