\begin{table}%t7
\caption{Mean intrinsic distance moduli (in magnitudes), as derived
by the Wesenheit functions of BL~Her and W~Vir~stars (the quantity~$N$
is the number of averaged values).}\label{tab7}
%\centering
\small
\begin{tabular}{lccccc}
\hline\hline
Name    &   $\mu_0$(BLH)      & $N$  & $\mu_0$(WV) & $N$ &$\mu_0$(RR)    \\
\hline
N2808   &   14.99 $\pm$ 0.06    & 1  &  --             &  --& 14.90\\
N5139   &   13.84 $\pm$ 0.08    & 4  &  13.78 $\pm$ 0.16 & 4 & 13.62  \\
N6254   &   13.39 $\pm$ 0.20    & 4  &  13.56 $\pm$ 0.16 & 2 &13.23  \\
N6273   &   14.69 $\pm$ 0.06    & 1  &  14.77 $\pm$ 0.06 & 2 &14.71  \\
N6284   &   15.77 $\pm$ 0.06    & 2  &   --            & --&15.93    \\
N6293   &   14.80 $\pm$ 0.06    & 1  &   --            &  -- &14.76\\
N6402   &   14.80 $\pm$ 0.08    & 8  &  14.93 $\pm$ 0.09 & 8 &14.86  \\
N6441   &   15.55 $\pm$ 0.07    & 2  &  15.53 $\pm$ 0.19 & 6 & 15.28  \\
N6441mp &   15.61 $\pm$ 0.07    & 2  &  15.58 $\pm$ 0.18 & 6 & 15.60   \\
N6715   &   17.19 $\pm$ 0.10    & 2  &  --             & --& 17.16\\
N6749   &   14.56 $\pm$ 0.08    & 1  &  --             &  --&14.51 \\
N6779   &   15.05 $\pm$ 0.06    & 4  &  15.31 $\pm$ 0.11 &4  &15.08 \\
\hline
\end{tabular}
\end{table}