CO isotopologs as observed with CARMA toward NGC 1333/IRAS 4C. 13CO shows a broader profile, and a significant part of the emission has possibly been resolved out by the interferometer, while C18O shows only narrow emission. The vertical line at +8 km s-1 is the velocity of the C18O peak. The plotted flux offset between the lines has been chosen to facilitate comparison. 12CO is not shown because it is heavily affected by absorption, which makes using it very difficult.
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