Continuum-subtracted spectra of our five sources (blue filled histograms). Two spectral windows were combined to produce them. The best fit of the baseline is subtracted from the data. The red solid line is our best-fit model and the black dashed line is the best-fit decomposition of the blend between HNC(5-4) and CN(4-3). Only lines with S/N > 3 are shown. The S/N of the blend between HNC(5-4) and CN(4-3) in SPT0551-50 only has an S/N of 2.6 using our deblending method, which could be underestimated. However, its S/N determined in Appendix B using the moment-zero map is 3.3. We thus included the line in the plot. The three bottom panels show sources with a low S/N. Their spectra were rebinned by a factor of two in the figure to allow a better visualization of the faint lines.
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