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By fitting the SdH oscillations, we infer a large metallicity parameter $k_F\\ell$ = 41, with a surface mobility ($\\mu_s\\sim$ 2,800 cm$^2$/Vs) much larger than the bulk mobility ($\\mu_b\\sim$ 50 cm$^2$/Vs). The plot of the index fields $B_{\\nu}$ vs. filling factor $\\nu$ shows a $\\frac12$-shift, consistent with massless, Dirac states. 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