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Global change in impedance (a) and (b),(c): Reconstructions at 1295.81 and 1296.57 seconds, respectively, with reference at 1282.4 seconds assuming constant contact impedances. (d),(e): Reconstructions at 1295.81 and 1296.57 seconds, respectively, with reference at 1282.4 seconds with simultaneous estimation of changes in contact impedances.
