Two-color image with the 8 μm and 24 μm emissions presented in red and green, respectively. The contours correspond to the 12CO J = 3 − 2 emission integrated between 48 and 57 km s-1, at the levels of 22, 26, and 30 K km s-1. The rms noise is about 4 K km s-1. The circle represents the extension of the source HESS J1858+020.
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