Spectra toward one H₂CO-bright cloud, the 20 km s^-1 cloud (ℓ = 359.892, b = −0.074), over the full APEX band. All detected lines are identified. The feature overlapping the C¹⁸O 2–1 line at about 219.5 GHz is the ¹²CO line from the upper sideband, suppressed by ~20 dB. There are artifacts at the band edges, e.g., below 217.0 GHz, because these spectra average a few different tunings without accounting for missing data at the band edges.