mtable: $\begin{array}{ccc}\text{c}& \text{b}& \text{a}\\ \text{f}& \text{e}& \text{d}\end{array}$

mtable: $\begin{array}{|ccc|}\hline \text{c}& \text{b}& \text{a}\\ \text{f}& \text{e}& \text{d}\\ \hline\end{array}$