12 μm flux obtained with ground-based telescopes (nuclear) versus 12 μm flux obtained with the Spitzer/IRS spectra. Both quantities are shown on log scales. A cross is shown to illustrate the error bars in these measurements (see Sect. 3). The left panel shows the results for the entire sample of objects with ground-based telescopes, the middle panel shows the objects classified as SB-dominated, and the right panel shows only objects with Spitzer/IRS spectra classified as AGN-dominated in this work (see text). The blue continuous line represents the one-to-one relation and the green dashed line the best linear relation.