(Upper panel) Comparison of the fractional abundances relative to 13CS derived for the two velocity components in Arp 220 and those measured in the starburst galaxy NGC 253. (Lower panel) Ratio of the relative abundances of each velocity component in Arp 220 and in NGC 253. Horizontal dotted lines are set to indicate a ratio of factor of 2 with the aim of guiding the eye in the comparison. Differences below a factor of 2 are not considered representative.
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