Diagnostic diagram of 6.2 μm/7.7 μm × 11.3 μm/7.7 μm PAH ratios. The long dashed line represents theoretical intensities of neutral to ionized PAHs (Draine & Li 2001). The dash-dotted line shows the position of molecules formed by 180 carbon atoms. Empty triangles are H ii and LINER objects taken from Smith et al. (2007) and Gordon et al. (2008), full triangles are SBs taken from Brandl et al. (2006), and full and empty circles are Sy 1 and Sy 2 of our and Gallimore et al. (2010) sample. Error bars are shown only for the 15 new AGNs; similar errors were found for the remaining objects.