\begin{table}%t1
%\begin{center}
\par
\caption{Optimal constant values for the $p$-factor for different
cases of interest. $v_{\rm rad|gauss} $ and $v_{\rm rad|min}$ are
the radial velocity deduced from theoretical line profiles using
the Gaussian and minimum method respectively. Estimator (1) and
(2) of the {\it constant} projection factor correspond to Eqs.~(\ref{est1}) and (\ref{est2}) respectively. In each case the
pulsational velocity $v_{\rm puls}$ and radius $\Delta R_{\rm
puls}$ used are indicated.} \label{p factor results}
%\centering
\par
\begin{tabular}{p{0.5cm}cc}
\hline \hline
                      &  Estimator 1                          & Estimator 2    \\
\hline \noalign{\smallskip}
\par
&$v_{\rm puls_{(s)}}=v(\tau_l=2/3)$               &$\Delta R_{\rm puls_{(s)}}=\int{v(\tau_l=2/3)}$ \\
$v_{\rm rad|gauss} $   &   1.35 $\pm$ 0.01                     & 1.32 $\pm$ 0.01    \\
$v_{\rm rad|min}   $   &  1.31 $\pm$ 0.01                      & 1.30 $\pm$ 0.01   \\
 \hline 
\noalign{\smallskip}
\par
&$v_{\rm puls_{(il)}}=\diffp{R(\tau_l=2/3)}{\phi}$ &$\Delta R_{\rm puls_{(il)}}=\Delta R(\tau_l=2/3)$\\
$v_{\rm rad|gauss}  $  &   1.33 $\pm$ 0.01                 & 1.32 $\pm$ 0.01    \\
$v_{\rm rad|min} $     &   1.30 $\pm$ 0.01                 & 1.29 $\pm$ 0.01     \\
 \hline 
\noalign{\smallskip}
&$v_{\rm puls_{(ic)}}=\diffp{R(\tau_{\rm c}=2/3)}{\phi}$   &$\Delta R_{\rm puls_{(ic)}}=\Delta R(\tau_{\rm c}=2/3)$\\
$v_{\rm rad|gauss} $   &   1.28 $\pm$ 0.01      & 1.27 $\pm$ 0.01     \\
$v_{\rm rad|min}  $    &   1.24 $\pm$ 0.01      & 1.24 $\pm$ 0.01      \\
 \hline
\par
\end{tabular}
%\end{center}
\par
\end{table}