Spectra of the H₂CS 10_0,10–9_0,9 line at nine positions toward IRAS 16293A illustrating the variation in line blending across the source. Central panel: spectrum in the central pixel (continuum peak); the other spectra are taken at a beam offset (0.5′′) in the different directions denoted in the top left corner of each panel. The vertical dotted line marks the system velocity of 3.8 km s⁻¹, and the vertical blue solid line indicates the peak velocity from the CH₃OH line used to isolate the target lines (in this case H₂CS 10_0,10–9_0,9).