Evolution of number of sinks during the temporal evolution. From top to bottom and from left to right: the NF, PSJo, HIIRo, and PSJ-HIIR simulations. For the simulations with HII regions, vertical lines indicate the formation of stellar objects, with colour-coding according to their mass. In the four panels, the solid lines indicate the total number of sinks, the other types of line (dashed, dash-dotted, and dotted, respectively) indicate the number of sinks with a mass lower than a given threshold (0.07, 0.5, and 1 M_⊙, respectively).