\begin{figure}
\begin{minipage}{0.5\textwidth}
\centering
\caption{***}
$\begin{array}{cccccccc}
T_1: & c_{12} & & c_{23} & & c_{34} & & c_{45}\\
T_2: & & c_{13|2} & & c_{24|3} & & c_{35|2} & \\\hline
T_3: & & &\pi_{14|23}& &\pi_{25|34}& & \\
T_4: & & & &\pi_{15|234}& & & \\
\end{array}$
\end{minipage}
\begin{minipage}{0.5\textwidth}
\caption{***}
$\begin{array}{cccccccc}
T_1: & c_{12} & & c_{23} & & c_{34} & & c_{45}\\
T_2: & & c_{13|2} & & c_{24|3} & & c_{35|2} & \\
T_3: & & &c_{14|23}& &c_{25|34}& & \\\hline
T_4: & & & &\pi_{15|234}& & & \\
\end{array}$
\end{minipage}
\end{figure}
This is my code, what's the problem?
(1) I want to have 1 figure (number). So I need a way to place those minipage in 1 environment (table doesn't work).
(2) The 2 arrays are a bit to wide. Can I change the distance between the columns?


