Spatial distribution of the observed CO J = 4 − 3 line. a) continuum-removed coadded spectrum on every pixel within a range of 454 <ν< 468 GHz. The vertical axis in each pixel ranges between −9.8 × 10-19 and 5.4 × 10-19 W m-2 sr-1 Hz-1. b) measured CO J = 4 − 3 intensity distribution, in the unit of W m-2 sr-1, within the mapped region of M 83. Each pixel has size 15′′ × 15′′ or 330 pc × 330 pc. The spatial resolution of the map is 42′′.
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