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Fig. 3

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Dual-band sources (white ellipses) overlaid on the two-color composite map (cyan: 1.3 mm; red: 3 mm) for Sgr C. The “Bridge” and “Main” subregions indicated by yellow boxes are further zoomed in. An interactive zoom-in webpage can be found in https://xfengwei.github.io/magnifier/index.html

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