\begin{table}%t4
\caption{\label{tab-dif-parameters}Parameters and coefficients of the various linear
regressions to the \emph{calibrating sample} (31 variables in set
\#1).} 
\small%\centerline
{
\begin{tabular}{lcc}
 \hline\hline
The relation & SD & R \\
\hline
$\rm [Fe/H]=-3.766-5.350{\it P}+1.044\varphi_{31}$ & 0.139& 0.960 \\
$\rm [Fe/H]= 0.603-5.375{\it P}+0.636\varphi_{41}$ & 0.152& 0.952 \\
$\rm [Fe/H]=-2.380-5.287{\it P}+1.636\varphi_{21}$ & 0.166& 0.940 \\
$\rm [Fe/H]=-0.233-4.532{\it P}+0.331\varphi_{51}$ & 0.169& 0.915 \\
$\rm [Fe/H]=2.100-4.694{\it P}-6.925A_{3}$         & 0.196& 0.897 \\
$\rm [Fe/H]=2.040-4.866{\it P}-8.399A_{4}$         & 0.227& 0.860 \\
$\rm [Fe/H]=1.841-4.804{\it P}-9.836A_{5}$         & 0.230& 0.855 \\
$\rm [Fe/H]=2.140-4.618{\it P}-2.663A_{1}$         & 0.232& 0.853 \\
$\rm [Fe/H]=1.510-4.342{\it P}-1.954A_{2}$         & 0.244& 0.820 \\
\hline
\end{tabular}}
\smallskip
 Notes:  The relation is derived
from the linear regression to the \emph{calibrating sample}, where~$P$ is period. The $\varphi_{\rm i1}$ is defined as
$\varphi_{i1}=\varphi_{i}-{\rm i}\varphi_{1}$, and $A_{i}$ refers to Eq.~(\ref{Sine}). SD: standard deviation of the fit. R: correlation
coefficient. 
\end{table}