Author response We would like to thank the referee for his/her careful reading of the manuscript and the helpful comments.
The first example is the result announced in Equation (4), concerning the phase shift due to the gravity gradient gamma. This effect was first calculated by Wolf and Tourrencin Physics Letters A 251 (1999) pp 241–246 and discussed with more details in A. Peters, K.Y. Chung and S. Chu, Metrologia 2001, 38, 25–61.