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Discussion
CASELLI: You talk about "hot core" species. Did you try to compare abundance ratios in Arp 220 with typical "hot core" abundances, to test if we are indeed observing ~ 106 Sgr B2 hot cores?
MARTÍN: Such comparison was performed with the abundances measured towards the starburst galaxy NGC 253, but not yet with Arp 220. However, Arp 220 and NGC 253 show significantly similar abundances but for the vibrational emission observed towards Arp 220. This difference points out towards a "hot core" origin but a closer comparison with Galactic templates is yet to be performed.