Top: Chandra image of the RBS 797 cluster with the contours at the −3, 3, 24, 96σ levels of the radio emission at 1.4 GHz (Doria et al. 2012). The resolution of the radio maps is 3″ × 3″ and 1σ = 10 μJy beam⁻¹. Shown in green is the final mesh that samples the emission above the 3σ level with cells of 4″ × 4″ size. The central cavities and the external sources were masked (gray) and, therefore they were excluded from the sampling. Bottom-left: I_R vs. I_X plot where each point corresponds to a cell of the sampling mesh. The red and green lines are, respectively, the best-fit power law estimated for (I_R ∣ I_X) and (I_X ∣ I_R). The blue line is their bisector power law. The value of k_SM is reported in the legend. Bottom-right: histogram of the distribution of values of k_SM produced by the Monte Carlo point-to-point analysis with 1000 cycles. The best estimate of k is reported in the legend with the associated 1σ error.