SED (circles) of knots A (upper panel) and B (lower panel) of the jet of 3C273 (from Sambruna et al. 2001; we also report the X-ray spectral slopes derived in He et al. 2023). Light blue data points report the (EBL-deabsorbed) VERITAS spectrum. The lines show the result of the model for the electrons accelerated at the shock (black) and at the shear (blue); solid lines for synchrotron, dotted lines for IC from synchrotron, and dashed lines for the IC CMB model. The red and green lines report the total emission.