\begin{table}%t5
%\centering
\par
\caption{\label{AR_sum}Average values of the $q$ amplitude ratio.}
\small\begin{tabular}{lccc}
\hline\hline
%\noalign{\smallskip}
Sample& $q$ & $\sigma$ & $N$ \\
%\noalign{\smallskip}
\hline
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Fundamental-mode Cepheids (solitary) & 32.79 & 4.01 & 96 \\
\ \ \ \  $\log P < 1.0$ & 33.54 & 3.95 & 62 \\
\ \ \ \  $\log P > 1.0$  & 31.42 & 3.79 & 34 \\
Fundamental-mode Cepheids (binary) & 33.66 & 5.68 & 115 \\
%\noalign{\smallskip}
\hline
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First overtone Cepheids (solitary) & 35.23 & 4.99 & 26 \\
First overtone Cepheids (binary)   & 36.58 & 4.59 & 24 \\
%\noalign{\smallskip}
\hline
\end{tabular} 
\end{table}