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(a) Both LRS resistances increased until the device was heated to the point at which an irreversible effect occurred (between 348 and 373 K). (b) The LRS ratio depended on the operating temperature and increased dramatically at around 350 K (the interpolant is only a guide for the eye). At this point, the second resistance state was no longer observed and (c) the device simply behaved as an ohmic resistor with a change in resistivity proportional to the increase in temperature.
