Fig. S1.

The cumulative mass distribution of objects at the end of pebble accretion (i.e., at 1 Mya) in three simulations that are identical except for α. These runs have $f_{pl}=0.004$, $s=50$ – $100$ km, and $\tau =0.025$ (our smallest value). Three values of α were studied; $\alpha =3\times {10}^{-4}$ (our fiducial value; black curve), ${10}^{-5}$ (cyan curve), and ${10}^{-5}$ (red curve). Note that all three curves are basically identical.