H₂O (top), CO (middle), and CH₃OH (bottom) ice column densities obtained in this study compared to Pontoppidan et al. (2004) (light grey) and Suutarinen (2015a) (dark grey). The CO column density towards SVS 4−10 is from Chiar et al. (1994). The coloured bars represent the ice column densities of the pure species or of the species in a mixture, and the dashed bars depict the total ice column densities obtained by summing the ice column densities of the pure species and of the species in a mixture.