Demonstration of mock X-ray observation. (a) Simulated X-ray surface brightness image of a AGN jet at a 60° viewing angle with overlaid radio intensity (white and red) contours. Red and white contours are a 5% and 30% of maximum radio intensity, respectively. To simplify, we assume that the radio emissivity ∝u_eB². The green annular sector showing the shock region to measure the surface brightness profile has been extracted. (b) Surface brightness profile (red circle) across the forward shock and best fit results using BknPow (black solid line) and ModBkn models (blue dotted line) for the sector in panel a. The BknPow and ModBkn models fit a jump with shock compression ratios C = 2.28 ± 0.06 and 3.37 ± 0.09, respectively.