ALMA spectra toward the SW and NE lines of sight to PKS 1830-211: (a) The 2₁₂–1₀₁ transition of (rest frequency 494.034 GHz) observed in 2022. (b) The 1₁₁–0₀₀ transition of (431.315 GHz, rest), observed in 2014. (c) For comparison, spectra of [C I] (³P₁–³P₀) taken from the same spectral window as observations of a). The best fits by a Gaussian line profile are indicated in red on top of the lines. All spectra have been normalized to the continuum level of each lensed image. For clarity, the spectra along the NE line of sight have been shifted by –0.01 (except for [C I] which has optical depths multiplied by 20 and shifted by –0.5) and are shown in blue.