Mass ratio of ices in planetesimals (final) relative to the pristine amount of gas and ices in ISM (initial) as a function of the distance to the star, for all models. The black and grey lines represent respectively the non-irradiated and irradiated models, both with (dashed lines) and without (solid lines) clathrates, and models assuming CO:CO₂ = 1:1 and 5:1.