Same as Fig. 7, but for the second sample (variations to the bold values in Table 1). The fiducial run produces just enough planetesimal mass in the disk to reach the MMSN mass in solids, even though the disk mass already is at the high end. From this point of view, either a higher initial dust-to-gas ratio, a higher planetesimal formation efficiency, or a higher fragmentation speed are required. Bottom left panel: no line is visible for α_t = 0.01 as no planetesimals are formed in that case.