\begin{table}%t4
\caption{\label{tab4}Results of PCA for Sample~1.} 
\small%\centering
\par
\begin{tabular}{cccc}
\hline\hline
Set & Principal Component& Eigen value & Cumulative $\%$ \\\hline
S1($R_{\rm gc},M_V,R_{\rm c}$)&1&1.6&53.1\\
 & 2&0.8&79.9 \\
 & 3& 0.6& 100.0\\\hline
S2($R_{\rm gc},M_V,c$)&1&1.4&47.3\\
 & 2& 1.1&82.9\\
 & 3& 0.5&100.0\\\hline
S3($R_{\rm gc},B-V,V_{\rm r}$)& 1&1.3& 43.7\\
 & 2& 0.9& 75.3\\
 & 3& 0.7& 100.0\\\hline
S4($R_{\rm gc},M_V,\mu_V$)& 1& 1.5&51.5\\
 & 2&0.9&81.9\\
 & 3&0.5&100.0\\\hline
S5($R_{\rm gc},M_V,c,R_{\rm c}$)& 1& 2.0&50.7\\
 & 2& 0.8& 71.3\\
 & 3& 0.7&88.9\\
 & 4& 0.4&100.0\\\hline
 S6($M_V,c,$ [Fe/H])&1&1.6&53.0 \\
 &2&0.8&80.0 \\
 &3&0.6&100.0\\\hline
 S7($c,R_{\rm c}$, [Fe/H])&1&1.6&54.7 \\
 &2&0.9&85.7 \\
 &3&0.4 &100.0 \\\hline
 S8(HBR, [Fe/H], $c$)&1&1.5&49.7 \\
 &2&0.9&79.2 \\
 &3&0.6 &100.0\\\hline
 \end{tabular}
 \end{table}