Absorption spectra toward the northeast 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, and ArH⁺J = 1–0 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), and CH⁺J = 1–0 (opacity scaled down by a factor of 146). All spectra are normalized to the continuum level and are referenced to the heliocentric frame taking z = 0.88582. The ¹³CH⁺ spectrum was smoothed to 3.3 km s^-1 for better signal-to-noise ratio (S/N) in individual channels.