o/p H₂ from the reference run F1_01 for different snapshots in time. Contour regions represent the N(o-H₂D⁺)/N(p-D₂H⁺), where the dashed contour has a value of 5 and solid contour 1. As a reference, we also report the APEX beam used in the observations(18′′), the spatial scale in parsec, and the age of the core (t_core). The total H₂ column density distribution is shown after convolution with a typical Herschel beam of 36′′. The ratio was calculated on a pixel-to-pixel basis.