Fig. 3.

The deviation (left axis) of the individually measured cyclotron frequency ratios $R_{4h}$ (${\nu }_c$($_{}^{84}{\text{Kr}}^{+}$)/${\nu }_c$($_{}^{84}{\text{Sr}}^{+}$)) from the final ratio value $\overline{R}$ and (right axis)) mass-excess values in this work compared to values adopted from AME2020 [28, 50]. The red points, accompanied by uncertainties, represent individual data obtained with the PI-ICR method in eight distinct time slots. The solid red line illustrates the weighted average value from this work, $\overline{R}$ = 1.000 022 902 36(48), and its 1$\sigma$ uncertainty band is shaded in red. The dashed blue line represents the difference between the new value in this work and the one referred to in AME2020, with its 1$\sigma$ uncertainty area shaded in blue