Core separation as a function of time for the individual jet component. The data combined are from the Jorstad et al. (2001) (open symbols), archive data, and our observation (solid symbols). Stars show the components from the VSOP observations by Lister et al. (2001). The first panel plots the proper motion with Jorstad et al. (2001) and our own observation (purple pentagon). The second shows a simple linear proper motion to fit the evolution track of components of 14 epochs. The last one displays a simple helical fit to the evolution track of components depending on a different classification of the components.