\begin{table}%t2
\par
\caption {\label{tab:isp}ISP linear least squares fitting parameters 
for the wavelength range 6400--7200~\AA.}
\tabcolsep 4.7mm
\begin{tabular}{ccccc}
\hline\hline
Phase & $b$  & $\sigma$ & $P_{6800}$ \\
(days)& (\% $\AA^{-1}$) & (\%)     & (\%) \\    
\hline
$-$10 &	  $-$0.0013~$\pm$~0.00008 & 0.10 & 4.57~$\pm$~0.05 \\
$-$8  &	  $-$0.0014~$\pm$~0.00007 & 0.09 & 4.42~$\pm$~0.04 \\
$-$7  &	  $-$0.0014~$\pm$~0.00004 & 0.05 & 4.51~$\pm$~0.03 \\
$-$6  &	  $-$0.0013~$\pm$~0.00005 & 0.06 & 4.45~$\pm$~0.03 \\
$-$3  &	  $-$0.0013~$\pm$~0.00004 & 0.04 & 4.52~$\pm$~0.02 \\
$-$2  &	  $-$0.0013~$\pm$~0.00003 & 0.04 & 4.50~$\pm$~0.02 \\
$-$1  &	  $-$0.0012~$\pm$~0.00005 & 0.06 & 4.54~$\pm$~0.03 \\
$+$39 &	  $-$0.0012~$\pm$~0.00005 & 0.04 & 4.51~$\pm$~0.02 \\
\hline
\end{tabular}
\end{table}