H₂(v = 0–4, j = 0) + HOC⁺, obtained using a QCT method, are shown with and without the ZPE correction for the ${\text{H}}_3^{+}$ ZPE. Solid lines represent the corrected results; dashed lines show the uncorrected ones. Dotted curves represent the Arrhenius fit to the ZPE-corrected rates. The yellow point in the right panel indicates the experimental rate constant reported by Smith et al. (2002), while the blue triangles represent the rate constants reported by Freeman et al. (1987).