Top panel: residual times left after subtracting the observed sequences of Δτ_obs from the model sequence of Δτ_mod in model 1 and then normalized to the maximum dynamical timescale of the knots in CARMA 7. The blue and red curves correspond to the northern and southern knots, respectively. The red circles mark the minimum values which correspond to the best fit between the observational and model data. Middle and bottom panels: Δτ_obs and Δτ_mod as a function of the knot serial number at the time instance when the best fit between the observed and model data was found. The middle panel provides the comparison for the northern knots, while the bottom panel – for the southern knots. The arrows show the mismatch between the individual data pairs.