Left: variability estimator S_V versus Eddington ratio for the Seyfert sample. Yellow triangles represent the average of the variability estimator in different Eddington ratio bins. Middle: photon index versus Eddington ratio for the Seyfert sample. Right: variability estimator S_V versus photon index for all the Seyfert galaxies in our sample, separated into the different types. Empty black circles indicate those sources with 10²³ < N_H < 4 × 10²³ cm^-2.