\begin{table} %t3
\caption{\label{tab3}Average main sequence fiducial points and colour width.}
%\centering
\begin{tabular}{ccc}
\hline \hline 
 $V$ & $V-R$ & $\sigma_{V-R}$ \\ 
\hline
 18.25 &   0.447   &   0.016 \\
 18.75 &   0.450   &   0.017 \\
 19.25 &   0.473   &   0.021 \\
 19.75 &   0.505   &   0.027 \\
 20.25 &   0.547   &   0.029 \\
 20.75 &   0.603   &   0.035 \\
 21.25 &   0.670   &   0.045 \\
 21.75 &   0.750   &   0.050 \\
 22.25 &   0.840   &   0.058 \\
 22.75 &   0.915   &   0.064 \\
 23.25 &   0.971   &   0.078 \\ 
 23.75 &   1.034   &   0.094 \\ 
 24.25 &   1.091   &   0.131 \\ 
 24.75 &   1.173   &   0.150 \\ 
\hline
\end{tabular}
\end{table}