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Fig. 1
Extinction maps of the ρ-Oph star-forming region (based on the 2MASS PSC Dobashi et al. 2013), contours from 1 to 18 mag in steps of 1 mag. The bottom map is a zoom on the area in which most sources are located (black square in the top map). Asterisks are sources with CN detection.
This figure is made of several images, please see below:
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