\begin{table}%t5
%\centering
\par
  \caption {\label{tab:M92}Observed and calculated colours for $\log g$ values along the sub-giant -- giant branch 
           for M92 and MARCS, respectively. The tabulated colours are mean colour values of
           stars close to the given fundamental parameters.} 
    \begin{tabular}{ccccccc}
       \hline \hline
              &      &        &  M92  &        & MARCS &    \\
       $\log g$ & $T_{\rm eff}$ &  $(b-y)_0$ & $c_0$ & $m_{0}$ & $c_{1}$ & $m_{1}$  \\
       \hline	    
       1.58   & 4682 &  0.584 & 0.516 &  0.109 & 0.519 &  0.117 \\
       2.05   & 4915 &  0.522 & 0.414 &  0.088 & 0.440 &  0.088 \\
       2.51   & 5125 &  0.473 & 0.374 &  0.075 & 0.384 &  0.067 \\
       2.99   & 5306 &  0.437 & 0.307 &  0.069 & 0.328 &  0.052 \\
       3.50   & 5525 &  0.400 & 0.281 &  0.057 & 0.295 &  0.047 \\
       3.72   & 5836 &  0.355 & 0.332 &  0.047 & 0.335 &  0.045 \\
       4.00   & 6302 &  0.299 & 0.383 &  0.064 & 0.411 &  0.055 \\
       \hline
    \end{tabular}
\end{table}