\begin{table}%tA.1
%\centering
\par
\caption{The calculated parameters for each magnitude interval for
Alpha Per. With the exception of~$f$ all parameters
have units of milliarcsenonds per year.\label{par}}
\begin{tabular}{cccccccc}
\hline\hline
Interval&$f$&$\sigma$&$\mu_{x\rm c}$&$\mu_{y\rm c}$&$\tau$&$\Sigma_{x}$&$\mu_{x\rm f}$\\
\hline
$10<R<12$&0.94&1.46&0.60&32.4&15.1&13.4&0.39\\
$12<R<14$&0.86&2.42&0.31&33.9&15.0&16.7&2.65\\
$14<R<16$&0.78&2.43&--0.07&33.9&21.8&16.2&1.54\\
$16<R<18$&0.76&2.96&0.72&34.6&20.3&17.1&2.165\\
\hline
\end{tabular}
\end{table}