Top panels: fraction of type 1 AGN hosts with tidal features (f_T) as a function of log L_[O III], log M_BH, and log λ_Edd. The error bar indicates the standard error of the proportion. Bottom panels: excess of f_T (e_T) as a function of log L_[O III], log M_BH, and log λ_Edd, defined as the ratio of f_T for AGNs to that of the matched inactive control sample. The dashed lines represent the range of the error value, computed through error propagation from the standard errors of the two proportions. The horizontal lines in the bottom panels represent e_T = 1, which indicates that the f_T of AGNs is identical to that of the inactive control sample. The gray vertical lines in all the panels mark the boundaries of the bins. The bin sizes in the bottom panels are set to be slightly larger (and hence there is a smaller number of bins) than those in the top panels, in order to reduce the larger uncertainties arising from the error propagation of the two proportion errors.