\begin{table}%t1
\par
	\caption {\label{tab:relations}Fitting coefficients of the CMR, the magnitude-surface brightness relation, and the power-law slope~$\alpha$ of the LF, with errors given in parentheses.}
	%\centering
\par
	\begin{tabular}{lrrrrrr}
	\hline\hline
	~ & \multicolumn{2}{c}{$(V-I)_0 = A\cdot M_V + B$} && \multicolumn{2}{c}{$\mu_{V,0} = C\cdot M_V +D$} \\ 
	\cline{2-3} \cline{5-6}
	~ & $A$ & $B$ && $C$ & $D$ & $\alpha$ \\
	\hline
	Centaurus & $-0.042$  & $0.36$   && $0.57$   & $30.85$   & $-1.14$ \\
	~         & $(0.001)$ & $(0.02)$ && $(0.07)$ & $(0.87)$  & $(0.12)$ \\
	Hydra~I  & $-0.044$  & $0.36$   && $0.67$   & $31.57$   & $-1.40$ \\
	~         & $(0.001)$ & $(0.01)$ && $(0.07)$ & $(0.99)$  & $(0.18)$ \\
	Fornax    & $-0.033$  & $0.52$   && $0.68$   & $32.32$   & $-1.33$ \\
	~         & $(0.004)$ & $(0.07)$ && $(0.04)$ & $(1.12)$  & $(0.08)$ \\
	\hline
	\end{tabular}
\end{table}