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This program completes the precise experimental mapping of the nucleon spin structure functions $g_1(\\nu, Q^2)$ and $g_2(\\nu, Q^2)$ and their moments started at SLAC, CERN and DESY at high $Q^2$, and continued at Jefferson Lab at intermediate $Q^2$. The results presented cover the domain where Chiral Effective Field Theory ($\\chi$EFT) should describe the strong interaction. They provide a comprehensive set of benchmark measurements for $\\chi$EFT. 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