Fig. 8
N2H+ ARTIST abundance estimate. Annuli averaged integrated intensity vs. annuli radius. Black line: IRAM 30 m VESPA data. Blue dashed line: ARTIST radial integrated intensity profile for a constant abundance of 2.5 × 10-10. Red line: ARTIST radial integrated intensity profile with a step function abundance of 2.5 × 10-10 and 1.5 × 10-10 for smaller and larger radius than ~8000 au (55 arcsec; indicated by the brown vertical dotted line), respectively.
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