Spectral age study of the perpendicular radio lobes. Top: Residual Chandra image of RBS 797, with overlaid white contours from the JVLA 3 GHz image of Fig. 2. The X-ray cavities described in Ubertosi et al. (2021) are shown with green ellipses and labeled. Bottom: Spectrum of the radio emission from the E–W and N–S cavities (see regions in top panel) in RBS 797, fit with a CI-off model (see Sect. 3.1.3 for details). Colored areas show the 1σ uncertainties on the best-fit model.