Column density of the main ice constituents computed with Nautilus for the static physical conditions as observed in L429-C as a function of visual extinction (left and middle). Model results are shown at 10⁵ yr in the left-hand panel and 10⁶ yr in the central panel. Diamonds represent the column densities observed by Boogert et al. (2011) at specific positions in the core. Column densities of the main ice constituents computed with the dynamical model as a function of column density (right). For all figures, the dust temperature is computed following Hocuk et al. (2017) and the O…CO_ice complex from Ruaud et al. (2015) is included.