\begin{table}%ta1
\caption{\label{y}Position of the CHARA output pupil.}
  \small%\centering
\par
  \begin{tabular}{ccccccc}
  \hline\hline
   POP & S1 & S2 & W1 & W2 & E2 & E1\\
  \hline
   POP1 & 0.045X+5.225 & 0.045X+4.460 & 0.045 X+4.166 & 0.045 X+1.973 & 0.045 X+4.070 & 0.045X+5.458\\
   POP2 & 0.045 X+6.049 & 0.045 X+5.283 &  0.045 X+4.990 & 0.045 X+2.796 & 0.045 X+4.893  & 0.045 X+6.281\\
   POP3 & 0.045 X+6.872 & 0.045 X+6.107 & 0.045 X+5.813 & 0.045 X+3.620 & 0.045 X+5.717 & 0.045 X+7.105  \\
   POP4 & 0.045 X+7.696 & 0.045 X+6.931 & 0.045 X+6.637 &0.045 X+4.443 & 0.045 X+5.540 & 0.045 X+7.928\\
   END & 0.045 X+8.447 & 0.045 X+7.682 & 0.045 X+7.388 &0.045 X+5.195 & 0.045 X+7.292 & 0.045 X+8.680\\
  \hline
  \end{tabular} 
\end{table}