Cycle 3 spectral windows centered on H¹³CN J = 4–3, HCN J = 4–3, CS J = 7–6, and HCO⁺ J = 4–3. The main transition of the spectral window is shown as a dotted line, assuming v_lsr = 5.4 km s⁻¹. The line model fits are overlaid in colored lines (red = CH₂DOH, blue = CH₃OCHO, purple = C₂H₅OH, pink = CH₃SH, green = all other species), while the observed spectrum is in gray. The top frames show the corresponding IRAS 16293B spectrum. The region from which the spectra was extracted can be seen in Figs. 4 and 5.