Theoretically expected time evolution of |$c \Delta z_{\rm 1PN.0PM}(t)$|⁠. The top panel is for the case of Boehle et al. with |$N=20$| in table 2. The bottom panel is for the case of GRAVITY collaboration with |$N=10$| in table 2. Dots on the curves denote the pericenter passage of S0-2 estimated by the 1PN|$\, +\,$|0PM approximation. All other cases in table 2 show almost the same behavior.