Spectra of CH and H₂O lines toward PKS 1830−211 NE and SW images (left, middle, respectively), and toward B 0218+357(SW) (right) observed by ALMA at different epochs. The spectra are colored by dates, as is indicated in the top left and top right boxes. The hyperfine structure of each CH Λ-doublet is indicated at the bottom of spectra. The spectrum of the H₂¹⁸O isotopolog, taken on 2014 May 05, is also shown for PKS 1830−211(SW) (top-middle box, in light blue). A zoom on the weak v ∼ +170 km s⁻¹ velocity component is shown for PKS 1830−211(SW), with the 2016 averaged spectra (in purple) instead of that taken on 2016 March 05.