Unconstrained GRACE monthly gravity field solutions from K-band range-rates and reduced-dynamic orbits. Processing details can be found in the following article: Koch I., Flury J., Naeimi M., Shabanloui A. (2020): LUH-GRACE2018: A New Time Series of Monthly Gravity Field Solutions from GRACE. In: International Association of Geodesy Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/1345_2020_92