Black hole and bulge masses of our best-fit base models (red points), plotted against SMBH masses. Green points show the bulge masses in the fits with different bulge density profile slopes. The grey line shows the observed M_BH − M_bulge relation from Schutte et al. (2019), with dashed lines representing the ±0.68 dex scatter. The blue line shows the equivalent relation from McConnell & Ma (2013), with dashed lines representing the ±0.34 dex scatter.