Sections of the continuum-subtracted spectrum recorded with ALMA toward Sgr B2(N2) in black. The synthetic spectrum of ethanol using the official JPL catalog entry is shown in red. Some lines are predicted to be much stronger than they appear in the spectrum, e.g., near 88 107 MHz and 91 059 MHz. A few other lines, e.g., near 90 354 MHz and 101 244 MHz, are stronger than predicted. Compare with Fig. 2. The central frequency of each panel is indicated below the x-axis in MHz; its width is given also in MHz in parentheses. The y-axis is labeled in brightness temperature units (K).