Fig. 3
Histogram of observed 12CO(2–1)/12CO(1–0) line ratios for our targets corrected for beam dilution as described in Sect. 4. Because of the larger beam, for Mrk 996 and UM 448, we show the APEX 12CO(2–1) measurements rather than the ones from IRAM. Also plotted are the line ratios corrected for beam dilution of a large sample of spiral galaxies observed by Braine & Combes (1992).
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