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a Measured and b calculated I-V curves, for reset (V > 0) and set (V < 0) transitions, obtained by applying triangular voltage sweeps. For preparing a reset state with variable R, the reset sweep applied to an initial set state with R = 400 Ω, is interrupted at Vstop. Then, the set sweep is applied, showing that Vset increases with Vstop, hence with R [86]
