We have added descriptions and contents in the revised manuscript.
3.3) seems quite simple for me and probably not optimal. Why do you think, that a sharp cut-off SH degree between the satellite-only GFM and EGM2008 is better than a rigorous combination by applying some sophisticated weighting approach? Could you please comment on the effects you introduce by applying such a sharp truncation combination approach. Your method for combining the satellite-only GFM with EGM2008 (sec.