The ALMA spectral scan of NGC 4418. The data are shown as a shaded histogram plot, the best fit for each molecule is shown as solid black lines. The total fit to the data is shown as a red solid line. The 1σ level is shown as a dashed green line. The residuals, together with the data rms, are shown below the spectrum as a green histogram plot with error bars. Emission lines above 3σ are labeled.