CH₃OH (panel a) and CO (panel b) gas-to-ice ratios (N_gas/N_ice) for the multiple protostellar system in Orion B35A and Serpens SVS 4. The dark green squares indicate the gas-to-ice ratios estimated by Perotti et al. (2020) for the Serpens SVS 4 cluster. The light green circles mark the ratios calculated in this study. The dotted light blue line in panel a represents the ratio estimated by Öberg et al. (2009) towards Class 0/I objects. The shaded areas indicate the estimated ranges of the gas-to-ice ratios.