Example of the broad Hβ and Fe ii emission-line subtraction without QSO-host deblending for SDSS J0924+0642. The observed spectrum (black line) and our best-fit model (red line) are shown in the upper panel. The best-fit model consisting of the broad Hβ and Fe ii λλ4948,5017 plus continuum is represented by the blue line with the corresponding residual spectrum of the narrow Hβ and [O iii] λλ4960,5007 indicated by the green line. The residuals of the total model are shown in the panel below. Details of the assumed model are given in the main text.