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. 2020 Feb 10;11(2):179. doi: 10.3390/mi11020179

Figure 7.

Figure 7

SEM images of hole no.4. U = 120 V, ton = 1 µs, toff = 1 µs, threshold current It = 0.3 A, working current Iw = 0.9 A. (a) magnification 200×, (b) magnification 1000×.