Rate coefficients of the pH₂D⁺ + oH₂− → oH₂D⁺ + pH₂ (left), oH₂D⁺ + pH₂− → pH₂D⁺ + oH₂ (middle), and (right) reactions as functions of temperature. Red lines represent ground-state-to-species rate coefficients, while blue lines represent species-to-species rate coefficients. Solid lines represent the raw data from Hugo et al. (2009), and dashed lines represent our fits using the modified Arrhenius rate law (see text). We highlight the different y-axis scaling in the panels.