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The oersted is the old Gaussian unit for H. It was adopted in 1934 by the
International Union of Pure and Applied Physics who took the view that B and
H in free space are fundamentally different even if their ratio mu0 is taken
as unity. B was measured in gauss in the same units (from W.S. Scott, "The
Physics of Electricity and Magnetism", second edition, 1977, p386)