PAH heating efficiency for galaxies in the subsample of the DGS with PAH observations. The observed ϵ_PAH are shown with black points, the corrected ϵ_{PAH,corrected} values are shown in red. The theoretical maximal value of 15% is indicated by the green line and the maximum observed value in Berné et al. (2022) in magenta. The vertical blue line indicates the current limit below which PAH are undetected in the DGS.