Cumulative displacement as a function of time, maximizing the cross-correlation coefficients of the downstream jet emission located at a declination less than −1.5 mas between each pair of successive epochs, shown for the right ascension direction (top) and declination direction (bottom). The blue data points corresponds to the result obtained by assuming the western component in the core region as the stationary core (Ref 1), while the magenta data points corresponds to the result obtained by assuming the eastern component, identified through WISE analysis, as the stationary core (Ref 2).