\begin{table}%t9
%\centering
\par
\caption{Observed metallicity index variation for V2109~Cyg together with 
some known high amplitude $\delta$~Sct-type variables from Rodr\'\i guez 
et~al. (\cite{retal91}). $\Delta$$\delta$$m_1$$^*$ means variation of the 
$\delta$$m_1$ parameter per each 0\fm1 variation in the~$\beta$ index.\label{tab9}}
\begin{tabular}{cccrrcrrc}  \hline\hline
Star &Period &$\Delta V$ &[Me/H] & $<$$\beta$$>$ & $\Delta$$\beta$ & 
$\Delta$$m_1$~ &$<$$\delta$$m_1$$>$ &$\Delta$$\delta$$m_1$$^*$ \\
~& (days) & (mag) & (dex)~~ & (mag) & (mag) &(mag) & (mag)~ & (mag) \\ \hline
RS~Gru          &0.1470 &0.49 &--0.3~~~ &2.76~ &0.112 &0.013    &0.035~    
&   0.020\\
RY~Lep          &0.2254 &0.35 &   0.2~~~ &2.71~ &0.073 &--0.011 &0.004~    
&   0.030\\
V1719~Cyg       &0.2673 &0.31 &   0.5~~~ &2.71~ &0.071 &--0.031 &--0.015~ 
&   0.050\\ 
V2109~Cyg       &0.1861 &0.16 &   0.14~~ &2.740 &0.038 &--0.002 &--0.001~ 
&   0.032\\
\hline
\end{tabular}
\end{table}