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Evolution of the current and the friction coefficient during a 30 minutes sliding run at (a) 1N in PBS solution (System A) and at (b) 64N in BCS solution (System B). Dotted line (Z-Z’) shows zero current. For System B , the current jump at t = ~1600 seconds corresponds to the point of application of the load, before sliding; sliding started at t = 2000 sec.
