\begin{table}%t1
%\centering
\par
\caption{\label{Tab_1}Data samples used in this study.}
\begin{tabular}{cccc}
\hline
\hline
{Name}&{NOAA} & {Date of} & {Heliocentric angle}\\
{}&{Active region} & {observation} & {cos$(\Theta$)}\\
\hline
Spot~A & {10923} & {Nov. 14${\rm th}$ 2006} & {0.982--0.996}\\
Spot~B & {10923} & {Nov. 14${\rm th}$ 2006} & {0.980--0.994}\\
Spot~C & {10930} & {Dec. 11${\rm th}$ 2006} & {0.991--0.999}\\
Spot~D & {10933} & {Jan. 05${\rm th}$ 2007} &{0.996--1.000}\\
QS 1 & {...} & {Mar. 10${\rm th}$ 2007} & {0.970--1.000}\\
QS 2 & {...} & {Sep. 06${\rm th}$ 2007} & {0.988--1.000}\\
\hline
\end{tabular}
\end{table}