Fig. 9.
Absorption lines obtained with ALMA towards PKS 1830−211, (top) for the HCO+ (2014 Aug. 27) and H2O (2016 March 5) species and (bottom) for the CH+ (2015 May 20) and ArH+ (2015 May 19) species. The spectra are normalized by the total continuum level (NE+SW+Einstein ring). We assume a flux ratio between NE and SW images of 1.5.
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