Left panel: M_BH obtained with the X-ray scaling method plotted vs. the values corresponding to sources accreting at the Eddington level. Middle panel: M_BH obtained with the SE method using the C IV line plotted vs. the Eddington values. Right panel: M_BH obtained with the SE method using the Hβ line plotted vs. the Eddington values. The symbols are color coded based on redshift. The continuous black line represents the one-to-one correlation and the dashed lines indicate departures by a factor of 3.