\begin{table}%t3
   %\centering
\par
   \caption{Coefficients of the general relation 
 $<K> =  a ~ {\rm Log} P_{\rm o} + b$. Values in parentheses are the
 uncertainties; "int'' and "mag'' indicate where intensity- and magnitude-weighted
 average magnitudes respectively have been used.\label{table1_PLK}}
  \begin{tabular}{llllll}
          \hline \hline
  \rm  Region     &  \rm  Gradient$_{\rm int}$ & \rm  Zero point$_{\rm int}$ &
  \rm  Gradient$_{\rm mag}$ & \rm  Zero point$_{\rm mag}$ & Comment \\
  \rm       &    $a$ & $b$ & \rm        $a$ &   $b$  \\
    \hline 
  \rm  Inner     &  \rm  --2.42 (0.16)  & 14.04 (0.05) & --2.40 (0.17) & 14.04
  (0.05) & this study \\
  \rm  Outer     &   - & - & \rm  --2.38  (0.15) & 13.93   (0.04)   &  new analysis
  of L90 data, excluding Blazhko variables \\
  \rm  Outer     &   - & - & \rm  --2.35  (0.14) & 13.95 (0.04)   &  new analysis
  of L90 data,
  including Blazhko variables \\
    \rm  Outer      &   - & - & \rm  --2.35 (0.15) & 13.95 (0.04) & L90 included Blazhko variables  \\
    \hline 
\end{tabular}
     \end{table}