\begin{table}%t1
\caption{\label{tab1}Compilation of the interstellar helium parameters as obtained with different methods and comparison with the velocity and temperature in the LIC.}
%\centerline
{
\begin{tabular}{cccccll}
\hline
\hline
$v_{\rm He}$                     &~$\lambda$               &~$\beta$   & ~$T_{\rm He}$   &~$N_{\rm He}$   & \textbf{Method}   & \\
{[km~s$^{-1}$]}                           & [$^{\circ}$]            &  [$^{\circ}$]  & [K]     &  [cm$^{-3}$]     &  Instrument & Reference \\
\hline
                                 &                         &               &          &                 & \textbf{Neutral gas} \\
$26.3\pm0.4$                     &~$74.7\pm0.5$           & ~$-5.2\pm0.2$  &~$6300\pm340$  &~$0.015\pm0.003$ & Ulysses GAS & Witte (2004) \\
                                &                      &                   &               &                 & \textbf{Pickup ions} \\
                                &                      &                   &               &~$0.0151\pm0.0015$ & Ulysses SWICS & Gloeckler et~al. (2004)\\
                                &                      &                   &               &                   & \textbf{UV~backscatter} \\
$24.5\pm2$                      &~$74.7\pm0.5$         &  ~$-5.7\pm0.5$  &~$6500\pm2000$  &~$ 0.013\pm0.003$  & EUVE   & Vallerga et~al. (2004)   \\
                                & ~$74.5\pm1$          &  ~$-6\pm1$      &                &                   &  Prognoz~6  & Lallement et~al. (2004) \\
                                \hline
\textbf{$26.24\pm0.45$ }    &  \textbf{$74.68\pm0.56$ }  &  \textbf{~$-5.31\pm0.28$}   &  \textbf{$6306\pm390$}   &    \textbf{$0.0148\pm0.0020$}   &  \textbf{Weighted mean}   \\
\hline
                             &                            &                           &                          &                                  & \textbf{Pickup ions} \\
                             & ~$74.43\pm0.33$            &                           &                          &                                   & ACE SWICS   & Gloeckler et~al. (2004)   \\
                             &                            &                           &                          &                                    & \textbf{Absorption}  \\
$^*$$25.7\pm1$                   &                            &                           & ~$^*$$7000\pm1000$           &                                    & Haute-provence            & Lallement \& Bertin (1992) \\
                                 &                            &                           &                              &                               & \textbf{Absorption} \\
                            &                             &                           & ~$^*$$7000\pm200$            &                                    & Hubble ST  & Linsky  et~al. (1993)  \\
                            \hline
\end{tabular}}
\smallskip
 $^{*}$  LIC bulk parameters.
\end{table}