Wagner C.A., Lerch F.J., Brownd J.E., Richardson J.E.; Improvement in the Geopotential Derived from Satellite and Surface Data; Report X9217620, Greenbelt/Maryland, 1976 product_type gravity_field modelname GEM8 earth_gravity_constant 0.3986004461E+15 radius 0.6378136300E+07 max_degree 25 errors no key L M C S end_of_head ========================================== gfc 0 0 .100000000000e+01 0. gfc 1 0 0. 0. gfc 2 0 -.484164600000e-03 0. gfc 3 0 .958400000000e-06 0. gfc 4 0 .540000000000e-06 0. gfc 5 0 .681000000000e-07 0. gfc 6 0 -.150500000000e-06 0. gfc 7 0 .933000000000e-07 0. gfc 8 0 .501000000000e-07 0. gfc 9 0 .262000000000e-07 0. gfc 10 0 .540000000000e-07 0. gfc 11 0 -.444000000000e-07 0. gfc 12 0 .377000000000e-07 0. gfc 13 0 .365000000000e-07 0. gfc 14 0 -.248000000000e-07 0. gfc 15 0 .102000000000e-07 0. gfc 16 0 -.310000000000e-08 0. gfc 17 0 .108000000000e-07 0. gfc 18 0 .810000000000e-08 0. gfc 19 0 .160000000000e-08 0. gfc 20 0 .181000000000e-07 0. gfc 21 0 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