Black hole mass against the host galaxy stellar mass M_* for delayed merger remnants (green crosses), numerical merger remnants (blue points), and the global population of main BHs (orange hexagons), at redshift 3.5 < z < 4. For the hexagons, darker colours correspond to a higher density of points, on a logarithmic scale. The geometric mean of M_• in several bins of M_* is shown by the solid lines for the three samples of BHs, with shaded regions corresponding to the 1σ error in the mean. The relation for numerical mergers is very similar to that of the full BH population, while the relation for delayed mergers is slightly shifted to higher BH masses in galaxies with mass M_* = 10⁹ − 10¹⁰ M_⊙.