Fig. D.1
Molecular gas surface densities computed from CO(3 − 2) observations (CO(1 − 0) for NGC 5194) versus the molecular gas surface densities computed from the CO(2 − 1) transition. All CO lines have been scaled to the CO(1 − 0) line in order to apply the same XCO factor. The black line represents the 1-to-1 relation where both lines yield the same molecular gas surface densities.
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