On the left-hand side, we show profiles of the SZ signal along the jet axis at 180 Myr. We vary the filling from thermal (﹩{{kT}}_{{\rm{e}}}=10\,\mathrm{keV}﹩) electrons to relativistic electrons that either follow a thermal distribution (﹩{{kT}}_{{\rm{e}}}=500\,\mathrm{keV}﹩) or a power-law distribution. Relativistically filled bubbles show a significantly larger SZ contrast, which is used to constrain the bubbles’ content. On the right-hand side, we contrast the profiles of our simulated bubble to an ellipsoidal cut-out from our initial conditions, in which the jet outburst is viewed perpendicular to the line of sight. The cut-out approximation mimics the signal of the simulated bubble well at the inner rim and starts to deviate toward the bubble edges due to the increased pressure of the shocked cocoon that surrounds the bubble in the simulation.