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The free-air co-geoid of Great Britain and Ireland was computed entirely by Stokes's integral, using mean free-air anomalies for 5" x 5", 1" x 1" and 10' x 20' compartments, with an estimated standard error of less than 1 m. Comparisons were made with astrogeodetic and Doppler-derived geoid heights, and values determined for the zero-order undulation and implied equatorial radius of the mean Earth ellipsoid. Geoid heights were also computed from GEM 10 potential coefficients.

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