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Comment: 4 pages, 2 figures, update figures, table and discussion
Comment: extensive revision, 4 pages and 4 figures
Comment: Added a few references, and corrected a few typos. 5 pages, 3 figures
Comment: 10 figures, to be published in Phys. Rev. B63, Jan. 15, (2000)
Comment: 4 pages, 3 figures. Please send comment to This version added a paragraph to discuss the implication of negative conductance
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