Fig. 4From: Evaluation of hydrological and cryospheric angular momentum estimates based on GRACE, GRACE-FO and SLR data for their contributions to polar motion excitationComparison of seasonal time series of χ1 (a, c) and χ2 (b, d) components of GAO, GRACE-based HAM/CAM (GSM, TWS, MAS land, and MAS global) and SLR-based HAM/CAM. Plots c, d present the same series as a and b, but with a changed scale for better visibility of the seasonal cycleBack to article page