Distribution of jet pressure P/P₀ of the reference case UNI-B in the X − Z plane at t/t_a = 3.75. The contours representing 1% of the peak value of normalized synchrotron emissivity at ν/ν_sc ≈ 8.2 × 10¹⁴ are overplotted as black lines, where ν_sc = 122 Hz is the frequency scale. The black lines indicate regions of X-ray spots resulting from the second population of nonthermal electrons generated in the vicinity of newly formed shocks due to shear.