(a) Phase diagram for a number of jets during drop impact as a function of We and Re. The jetting phenomena are indicated with symbols (blue circles for capillary-induced lamella, red squares for a merged single jet comprising lamella and ejecta, black triangles for separate lamella and ejecta where the latter is finally reabsorbed into liquid and green stars for separate lamella and ejecta where the latter finally dissociates into tiny droplets). Each region with (i) only lamella, (ii) a single jet comprised of the ejecta and lamella and (iii) two jets of the ejecta and lamella is coloured with blue, red and white, respectively. (b) Phase diagram for a number of vortex rings in the drop impact as a function of We and Re. The number of vortex rings is indicated with the symbols shown in the legend. The coloured regions are the same as those in a. It is clearly shown that no vortex ring is generated in region ii (single jet comprising lamella and ejecta) even if the Ohnesorge number is smaller than the critical value of 0.011. (The error range of each data point is much smaller than its symbol size.).