Top panel: final abundances of H₂O (red lines), CO (blue lines), and CH₃OH (green lines) in ices as a function of temperature. Middle panel: final CH₂DOH to CH₃OH abundance ratio in ices (green lines) and final atomic D/H in the gas phase (blue lines) as a function of temperature. Bottom panel: final CH₂DOH to CH₃OD abundance ratio as function of temperature. In all panels three densities are considered: n_H = 10⁴ (dashed), 10⁵ (dotted), and 10⁶ (solid) cm⁻³.