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.
Generally it is a good paper and it was interesting to me. However, comparing with the conclusions (I mean, the computed potential value) the paper is a bit too long. I can accept it, because it is a good explanatory text, however some partially offtopic or superfluous parts (e.g. point 2.1.2 (keeping the Table 1 only), the unified topo data in lines 181-191, the „textbook equations” of the gravity of a prism in page 7 and the textbook adjustment equations in page 8). It is rather an editorial question. The paper is good and acceptable without them, too.