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Fig. 4
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Three-colour image presenting the IR emission at 8 (red), 4.5 (green), and 3.6 μm (blue) obtained from Spitzer-IRAC. The contours represent the averaged CN emission as presented in Fig. 3. The fields of view are about 1.5 arcmin for all cases except for G23.389 which is about 3 arcmin.
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