Spectra of the ortho (upper panel) and para (lower panel) forms of H₂Cl⁺ toward PKS 1830−211. The y-axis is in unit of column density.The opacities were converted into column densities assuming that the excitation is locked to the temperature of the CMB. The spectra of the SW line of sight have been divided by that of the NE. The SW absorption appears as positive feature near v = 0 km s^-1, while the NE absorption appears as the negative feature near v = −150 km s^-1. The fit with five Gaussian velocity components, including both ortho and para forms, is shown in blue on top of the spectras, and the corresponding residuals are shown in the lower boxes. The velocity scale is set for the strongest hyperfine component. The hyperfine structure is plotted at the base of each spectrum.