Monthly solutions: gravity_field ITSG-Grace2016_nLL_YYYY-MM 3.9860044150e+14 6.3781363000e+06 LL formal fully_normalized zero_tide Daily solutions: gravity_field ITSG-Grace2016_n40_YYYY-MM-DD 3.9860044150e+14 6.3781363000e+06 40 formal fully_normalized zero_tide