Fig. 5: Evolving droplet coverage area.

Droplet coverage area associated with each pit is provided as a function of time in (a) and (b). For all pits except pit 6, no change in droplet coverage area was observed after the final datapoint provided for that pit. Arrows indicate time steps associated with the acceleration of pit growth for pits 4, 5, and 6. The time steps between which pits nucleated are also indicated. Note that pits 1, 2, and 5 nucleated before the first scan was completed. Error bars represent measurement uncertainty in time as described in the “Methods”.