Interferometric maps of Sgr B2(M). Top row: SMA dust continuum map at 870 μm (i.e. 345 GHz). Bottom row: VLA free-free continuum map at 7 mm (i.e. 40 GHz). Left column: observations. Middle column: synthetic maps. Right column: difference plot. The field of view is the same for both rows. The green pluses denote the center of the Hii regions and the black circles denote the center of the density cores.
This figure is made of several images, please see below:
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