Carbon and oxygen isotope ratios in starburst galaxies: New data from NGC 253 and Mrk 231 and their implications

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Fig. 5

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¹³CO, C¹⁸O, and C¹⁷O spectra from NGC 253 (see also Figs. 3 and 4) on a LSR V_LSR = 0 km s^-1 frequency scale. The profiles were smoothed to channel spacings of ~8.5, 8.5, and 17 km s^-1 from top to bottom, which corresponds to 6.25 MHz.

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