Table 2 Correlation coefficients and relative standard deviations (RSD) in percentage of the polar motion excitation functions for the oceans \(\chi ^\text{O}\) derived from GRACE GFZ RL06 gravity field solutions using the DDK filter or by applying the DDK filter in combination with the global grid point gain factors k (inclusive scaling factors \(f^i\)) with respect to polar motion excitation functions based on ocean model ECCO data and on ESMGFZ data

From: Reducing filter effects in GRACE-derived polar motion excitations