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Fig. 6

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The grayscaling presents the 8 μm data toward the R1 (top) and R2 (bottom) regions as observed with MSX. The contours outline the extinction from Kainulainen et al. (2009) for R1 in 1 mag steps between Av of 5 and 9 mag plus additional contours at 11 and 13 mag, and for R2 in 1 mag steps starting at an Av of 2 mag. The white stars mark the only sources that were also detected with MSX at 21 μm.

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