Figure 6
From: The onset of electrospray: the universal scaling laws of the first ejection

Dimensionless diameter of the first ejected droplet versus
(left) and
(right).
The meaning of the symbols is the same as that in Fig. 5. The dashed line in the left-hand graph is the fit [Eq. (8)]. The solid, dotted and dot-dashed lines in the right-hand graph are the scaling laws in [ref. 7, Fig. 3a].