Normalized distributions of log(Lum[OIII]) (top panel) and the accretion rate ℛ (bottom panel). The solid line represents the ℛ distribution using the same α and β parameter for both barred and unbarred galaxies. The dashed line represents the ℛ distribution taking into account different values of alpha and beta for barred galaxies. The vertical line in both graphs represents the median of the barred sample.