Fig. 9
Gas and ice variations. Panels a–d: relation between CO, CH3OH, and H2O ice and CO and CH3OH gas column densities. Panels e–h: relation between CO, CH3OH, and H2O ice and CO and CH3OH gas abundances relative to H2. The coloured filled circles identify the SVS 4 stars; the dashed grey line divides the sources into two groups: YSOs located within 9000 AU from SMM 4, and YSOs located at distances >9000 AU from SMM 4.
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