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We report tunneling characteristics of two very thin stacks, each about 23 and 27 nm thick, of intrinsic Josephson junctions fabricated on the surface of Bi 2 Sr 2 CaCu 2 O 8 single crystals at various temperatures above and below T c . The current-voltage (I-V) characteristics are represented by a set of 15-18 resistive branches, the number of which corresponds...