Fig. 11.
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Arm-interarm variation of α12CO(1−0)in M51. The graph shows the 12CO(1–0) intensity binned by spiral phase. The blue points show the stacked line ratio by spiral phases in steps of 20°, increasing counter-clockwise. The vertical red and blue shaded regions show the extent of spiral phases that correspond to the northern (red) and southern (blue) spiral arm of the galaxy.
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