... Losch1
email: mlosch@awi-bremerhaven.de
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... Seufer2
email: vseufer@gfz-potsdam.de
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... same.3
The reason why this is important, is that you are substracting two potentials from each other, the potential of the model and the potential of the ellipsiod and in principles these two can be computed with different constants $ GM$ and $ a$ (see Smith, 1998).
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