Iron Kα EW versus X-ray luminosities and predicted trends obtained for different values of the equatorial column density of the torus. The points are the values of the EW of the iron Kα line reported by Shu et al. (2010) and obtained by averaging multiple Chandra/HEG observations of AGN. The two blue dash-dotted lines are the fits to our simulations of the X-ray Baldwin effect using the θ_OA − L_X relationship of Hasinger (2008) for the Seyfert regime (log EW = 1.01−0.17log L_X,44 for , and log EW = 2.05−0.08log L_X,44 for ). The blue long-dashed lines represent the EW − L_X relations obtained in the quasar regime (log EW = 1.17−0.73log L_X,44 for and log EW = 2.14−0.39log L_X,44 for ) using the relationship of Hasinger (2008), while the green dashed lines represent those attained using the relationship of Burlon et al. (2011). The intercepts obtained in the quasar regime have been modified to match those obtained at lower luminosities.