Difference in water density between the reference Herbig model (n_sp,1) and the model with new rate constants with accurate description of atom tunneling (n_sp,2) for the reaction H₂ + OH → H₂O + H according to Table 2. The black dashed line indicates the surface of the ice reservoir excluded from the statistical analysis, the red dashed line a change in species density of a factor of three. Water abundance (right) in the Herbig disk model that uses the new rate constants; the red dashed line indicates the surface of the ice reservoir.