\begin{table}%t1
\caption{\label{table:1}Parameters of thread oscillating motions in Figs.~\ref{fig4} and~\ref{fig5}.}             
%\centering
\small
\begin{tabular}{c l l l l l} 
\hline\hline                 
    & Number of  & Period &  Oscillation        & Phase                 &  Drifting           \\
   & observed    &      & amplitude         & velocity              & velocity  \\
   & periods   &  (s)     &      (km)         &  (km s$^{-1}$)         &  (km s$^{-1}$) \\ 
\hline                        
G1 & 3           & 255       & 1080             & 8.5                      & -- \\
G2 & 5           & 292       & 960             & 6.6                      & 1.0 \\
G3 & 3           & 210       & 720             & 6.9                      & -- \\
G4 & 6           & 210       & 960             & 9.1                      & 4.0 \\
G5 & 3           & 315       & 840             & 5.3                      & -- \\
G6 & 2           & 240       & 1080             & 9.0                      & -- \\
G7 & 3           & 525       & 1320             & 5.0                      & 3.6 \\
G8 & 8           & 278       & 860             & 6.9                      & -- \\
G9 & --           & --       & --             & --                      & 9.2 \\
G10 & --           & --       & --             & --                      & 7.5 \\
G11 & --           & --       & --             & --                      & 3.2 \\
G12 & 5           & 278       & 1080             & 7.8                      & 8.1 \\
G13 & 6           & 276       & 840             & 6.1                      & 4.8 \\
G14 & 3           & 360       & 1320             & 7.3                      & 2.7 \\
G15 & 4           & 240       & 1080             & 9.0                      & 1.9 \\
G16 & 2           & 390       & 1440             & 7.4                      & -- \\
\hline                                   
\end{tabular}
\end{table}