Spatial evolution of the turnover values along the jet ridge line for the May 2005 observation (2005.39). We used a beam size of 0.95 × 0.33 mas with a PA of −13° and pixel size of 0.03 mas. The error estimates were derived from a Monte Carlo simulation (see text for more details). Top panel: Turnover frequency, ν_m; middle panel: turnover flux-density, S_m; bottom panel: optically thin spectral index, α₀