Fitted N _H as a function of obscuration diagnostics for the 12 μm sample. The sources without error bars either had the best-fit absorption equal to the Galactic value, and therefore frozen at this value during fitting, or had N _H error bars smaller than the symbol size. The dashed lines indicate the boundary for a Compton-thick column density ( N _H ⩾ 1.5 × 10 ²⁴ cm ⁻²) and the dash-dotted line indicates nominal Compton-thick boundaries based on obscuration diagnostics (log ( ) ⩽ 0.9 dex, an order of magnitude less than the average value for Sy1s, and Fe Kα EW ⩾ 1 keV). Sources that are likely heavily obscured according to the obscuration diagnostics, yet have low-fitted column densities, are labeled. Color coding same as Figure  4.