Fig. 2.

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Integrated 12CO(6–5) line intensities as a function of aperture. For clarity sake, points for NGC 1808 and NGC 660 were shifted down by 0.80 and 0.85, respectively. Solid lines are least-squares fits to the data. Six galaxies have poor data coverage and are not shown. NGC 613, IC 342, and NGC 2559 have a single data point each. NGC 4945, NGC 5236, and NGC 6240 have only two data points each.
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