Comparison of observed (red symbols) and expected break frequencies for regions B, C, and D3 as a function of their 3D radial distances (r_3D) from the cluster core. Two cases are shown: the solid circles and open squares correspond to r_3D = r_proj and $r_{3\mathrm{D}}=r_{\mathrm{proj}}\times \sqrt{2}$, respectively. The brown curve shows the shift of the break frequency with distance due to pure adiabatic losses with $B\propto P_{\mathrm{gas}}^{1/2}$. The two blue lines show the characteristic dwell time (in units of 10⁸ yr) of a bubble at a given radius for two values of the bubble velocity. The black lines show the estimated break frequencies due to radiative losses for these velocities. The solid line is for constant B and the dashed line is for $B\propto P_{\mathrm{gas}}^{1/2}$. The corresponding radial dependencies of B are shown with the solid and dashed magenta lines for a constant and declining magnetic field, respectively.