Abundance ratio of H₂Cl⁺ (derived from ortho and para forms, shown in top and bottom panels, respectively) over HCl across absorption profile toward MA0.89 SW. We use measured ortho-to-para ratio of three to obtain total H₂Cl⁺ column density. Abundance ratio is calculated only for channels where signal-to-noise ratio of normalized profile of both H₂Cl⁺ and HCl is higher than five.