Fig. 3.

Pore histograms show the distribution of pore radii, $N(r_{\mathrm{p}})$, at various times in response to the 1.5 kV/cm, $100\mathrm{\mu }\mathrm{s}$ pulse (a–d) and the 40 kV/cm, 10 ns pulse (e–h). The maximum pore radius $r_{\max }=60\text{nm}$, but the display has been truncated to 40 nm in consideration of the maximum pore radii observed