N(H₂S)/N(OCS) of the studied sources. Different symbols represent different types of sources: “star” for close binary (<500 au), “square” for wide binary (500–5000 au), and “circle” for single sources (within 5000 au). The upper limits on the interstellar ice (W33A and Mon R2 IRS2) ratios are shown by downward arrows. The uncertainty on the H₂S/OCS ratio in comet 67P/C-G is shown by the coral shaded region. The lower limit on the ratio in IRS7B is shown by an upwards arrow. The H₂S/OCS ratios for the cold (cyan) and warm (orange) components of Bl-c, and cold (cyan) component of BHR7l -1RS 1 are the best-available estimates pending opacity issues. These latter three data points do not have error bars associated to them in the figure (so as to indicate that they are merely estimates).