\begin{table}%t1
%\centering
\par
\caption{\label{offsets}Data on color and magnitude offsets applied to the CMDs of
regions with different reddening.} 
\begin{tabular}{cccccc}
\hline \hline
Reddening & $\Delta(B-V)$ & $\Delta(V-I)$ & $\Delta(B-I)$ & $\Delta V$ & $\Delta U$ \\
grade & mag & mag & mag & mag & mag \\
\hline
blue  &    0.04   &     0.09  &     0.15  &      0.20  &      0.25  \\
green  &    0.02   &    0.04  &     0.07  &      0.10  &      0.15  \\
yellow  &    0.01  &    0.01  &     0.02  &      0.05  &      0.05  \\
\hline 
\end{tabular}
\end{table}