Fig. 5.
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Comparison of the 12CO/13CO J = 1 − 0 and 12CO J = 2 − 1/J = 1 − 0 line ratios for 23 galaxies in our sample. The disc regions and galactic nuclei are represented with open and filled symbols, respectively. The blue lines show the mean error for points without upper or lower limits. The red symbols represent the median value for the sample.
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