Contours of the H2CO21,1−21,2 naturally weighted emission in the W51 Main region at 3 velocities superposed on the Ku-band 14.5 GHz continuum map. a) shows the peak velocity of the e2 core, where the center of the core is missed because it is in absorption against the bright continuum peak; b) shows the overlap velocity; and c) shows the e8 core
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