Page 2: "...one third have signatures of Seyfert/LINER nuclei" -- There is also at least 6 more galaxies that show no AGN signature in the optical but have nuclear X-ray measured fluxes that may indicate AGN activity (Tajer+05 and Grier+11)
Figure 5: Is NGC 4592 (qpah(%)=0 according to Fig. 4) excluded from Figure 5, qpah panel?

--> I added those refs.  N4552 is only in SINGS and not also in KINGFISH, so it doesn't show up in these plots by definition.  However, your comment applied to a couple other galaxies, and thanks to your keen observation I've now updated the figure to include a couple other q_PAH=0 systems.  [ My plotting script had excluded these b/c elsewhere I was computing some unused stats on the ratios, and I was trying to avoid dividing by zero ... ]

Figure 6: Can you also mark the Irr galaxies with red circles in the left panel?

--> Good suggestion.