\begin{table}%t1 \caption{\label{parameters}Parameters of J1430+4204 estimated from radio variability, VLBI imaging and the inverse Compton process.} %\centering \par \begin{tabular}{lcccc} \hline\hline \noalign{\smallskip} Method & $\delta$ & $\Gamma$ & $\beta_{\rm app}$ & $\mu$ (mas~yr$^{-1}$) \\ \hline var & ${ 9.0}$ & ${ 4.8}$ & ${ 2.2}$ & $0.02$ \\ VLBI & $8.6$--$12.0$ & $4.6$--$6.8 $ & $2.0$--$4.2$ & $0.02$--$0.03 $ \\ IC & $11.0$--$15.9$ & $6.1$--$10.3$ & $3.4$--$8.6$ & $0.03$--$0.07$ \\ \hline \end{tabular} \end{table}