\begin{table}%T7
\caption{\label{tab-modelratios}Expected period ratios from models. }
\small%\centering
\par
\begin{tabular}{cccc}
\hline\hline\noalign{\smallskip}
  & $v_{\rm{rot}}$ = 150~\kms & $v_{\rm{rot}}$ = 150~\kms  & $v_{\rm{rot}}$ = 180~\kms\\
  & $Z = 0.018$                  &    $Z = 0.02$                  & $Z = 0.018$ \\
  \hline
  F/1H  & 0.782 & 0.782 & 0.786 \\
  1H/2H & 0.812 & 0.812 & 0.813 \\
  2H/3H & 0.842 & 0.841 & 0.843 \\
  3H/4H & 0.863 & 0.862 & 0.864 \\
  4H/5H & 0.880 & 0.880 & 0.882 \\
  5H/6H & 0.892 & 0.892 & 0.893 \\
  \hline
\end{tabular}
\end{table}