Jet streamlines (300) used to calculate the integrated flux density along the flow, parallel to the jet axis from MOJAVE (central line in black), overplotted on the 1.6 GHz (left panel) and 4.8 GHz (right panel) RadioAstron contours maps (both convolved with the MOJAVE beam). The starting point is set at 4 mas from the core, where the spine/sheath structure becomes evident. Central panel: integrated flux density, versus distance from jet axis, calculated along jet streamlines for the 1.6 GHz (left) and 4.8 GHz (right) RadioAstron images. The profile uncertainty is reported as a shaded area.