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Etched tip SEM images for the commercial Pt coated tip with 150 nm-thick SiO2 film deposited by PECVD taken from the (a) top and (b) 45° tilted view, and for the commercial Pt coated tip with 30 nm-thick SiO2 film deposited by sputtering taken from the (c) top and (d) 45° tilted view.
