Left: region of about 30′ × 30′ towards SNR G35.6-0.4 presenting the emission at 8 μm with contours of the radio continuum emission at 20 cm. The contours levels are 17, 22, and 30 K. The first contour is slightly above the data 3σrms. The circle shows the position and the extension of HESS J1858+020. We note that the SNR is possibly partially superimposed on an HII region. Right: smaller portion of the region displaying the 8 μm emission and showing the area mapped with the molecular observations (yellow box).
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