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Topographic and topoisostatic reductions of gravity field measurements are important in geodesy and geophysics. Reductions filter high frequencies from gravity which are then used in geoid modelling or investigations of the EarthпїЅs structure. Practical computations of reductions are performed using digital elevation/bathymetric models as input data and some approximation scheme of the EarthпїЅs structure. The main parameters describing the EarthпїЅs structure are crustal, mantle and water density, density contra...