Absorption spectra toward the southwest image of PKS 1830−211: top: of the CH⁺J = 1–0, OH⁺N = 1–0 (deconvolved from its hyperfine structure and shown for its strongest hyperfine component), HF J = 1–0, ortho-H₂O 1₁₀–1₀₁, ArH⁺J = 1–0, and para-H₂S 1₁₁–0₀₀ lines; bottom: of the ¹³CH⁺J = 1–0, SH⁺N_J = 1₂–0₁ (deconvolved from its hyperfine structure and shown for its strongest hyperfine component), ArH⁺J = 1–0 (opacity scaled down by a factor of three), para-H₂S 1₁₁–0₀₀ (opacity scaled down by a factor of three), and ortho-HO 1₁₀–1₀₁ lines. All spectra are normalized to the continuum level and are referenced to the heliocentric frame taking z = 0.88582.