Authors’ response We would like to thank the referee for his/her careful reading of the manuscript and the helpful comments.
The relative location of the test mass to the cold atom cloud should be clearly stated during the calculation, as the gravitational force is a vector. If the test mass is not located in the direction of the evolution trajectory of the atom cloud, the applicability of some formulas (e.g. Equation (3)) need to be verified. It will be helpful to the readers if a figure is provided to show the locations.