\begin{table}%t2
\caption{\label{tab_ident}Identification of the lines used in this study.}
%\centering
\par
\begin{tabular} {lccr}
\hline
\hline
Line& Transition&Wavelength&Lines comprised in\\
    &           &\mum      &{\it EW} measurement \\  
\hline            
\pab     &3$-$5     &1.2822 &\heii~(6$-$10)~\lam1.2816\\
         &        &       &\hei~(3p$-$5s)~\lam1.2849\\
         &        &       &\hei~(3d$-$5f)~\lam1.2788\\
         &        &       &\ciii~        \lam1.2794\\ 
\hline
\pag     &3$-$6	  &1.0941 &\heii~(6$-$12)~\lam1.0936\\
         &        &       &\hei~(3d$-$6f)~\lam1.0916\\
         &        &       &\ciii~        \lam1.0920\\
\hline
\bra     &4$-$5	  &4.0523 &\heii~(8$-$10)~\lam4.0506\\
         &        &       &\hei~(4f$-$5g)~\lam4.0409\\
         &        &       &\hei~(4f$-$5g)~\lam4.0377\\
\hline
\brg     &4$-$7	  &2.1661 &\heii~(8$-$14)~\lam2.1652\\
\brten   &4$-$10	  &1.7367 &                         \\
Br~11   &4$-$11    &1.6811 &                         \\ 
\pfg     &5$-$8 	  &3.7406 &                         \\
Pf~9    &5$-$9     &3.2970 &                         \\
Pf~10   &5$-$10    &3.0392 &                         \\
\hline
\heii    &5$-$7	  &1.1630 &                         \\
\hline
\heii    &6$-$7     &3.0917 &\heii~(8$-$11)~\lam3.0955\\  
         &        &       &\ciii~        \lam3.0878\\           
         &        &       &\ciii~        \lam3.0843\\           
         &        &       &\ciii~        \lam3.0763\\           
\hline
\heii    &6$-$11	  &1.1676 &                         \\
\heii    &7$-$10	  &2.1891 &                         \\
\heii    &7$-$12	  &1.6923 &                         \\
\heii    &7$-$13    &1.5722 &                         \\
\hline
\hei     &2s$-$2p	  &2.0587 &                         \\
\hei     &3p$-$4s	  &2.1126 &                         \\
\hei     &3p$-$4s   &2.1138 &                         \\
\hei     &3p$-$4d	  &1.7007 &                         \\
\hei     &3p$-$5d   &1.1972 &                         \\
\hei     &3d$-$5f	  &1.2788 &                         \\ 
\hei     &4p$-$5d	  &3.7036 &                         \\
\hline
\civ     &3d$-$3p   &2.0802 &                         \\ 
\ciii    &7$-$8     &2.1151 &                         \\
\hline
\end{tabular}
\end{table}