Thank you for your comment. The unified topo data and Equation are used to compute RTM quasi-geoid height. We have added some expressions about the using of unified topo data and equations, which makes us easily misunderstand about the calculation process in the text. Please refer to page 12, Line 402.
Models Max Min Mean STD EIGEN-6C4 1.007 -1.696 0.048 0.187 GECO 1.579 -1.703 0.041 0.223 SGG-UGM-1 1.003 -1.671 0.052 0.194 SGG-UGM-2 1.003 -1.704 0.051 0.191 XGM2016 1.016 -1.757 -0.020 0.214 XGM2019 1.705 -1.737 0.081 0.213 Point 6: Your method for combining the satellite-only GFM with EGM2008 (sec.