Paragraph column in tabular working only in the first column

Question

I have a two-column tabular environment and I'd like for both of these columns to have the text aligned at its middle (both vertically and horizontally), along with increased row height:

But with the following input:

\begin{center}
\begin{tabular}{m{1.8cm}|m{1cm}}
Problem & $\beta$ \\[0.2cm]
\hline
LCR-1 & 0.25 \\ [0.2cm]
\hline
LCR-10 & 0.05 \\ [0.2cm]
\hline
LCR-0.2 & 0.575 \\ [0.2cm]
\hline
Airplane & 0.05 \\ [0.2cm]
\hline
DR & 0.27 \\[0.2cm]
\end{tabular}
\end{center}

Only the first column is as required. The text in the second column is still aligned at top left.

Any hints?

Answer 1

\documentclass[11pt]{article}
\usepackage{array,ragged2e}
\newcolumntype{C}[1]{>{\Centering}m{#1}}
\begin{document}

{\def\arraystretch{1.5}
\begin{tabular}{ C{1.8cm} | C{1cm} }
Problem & $\beta$ \\\hline
LCR-1 & 0.25      \\\hline
LCR-10 & 0.05     \\\hline
LCR-0.2 & 0.575   \\\hline
Airplane & 0.05   \\\hline
DR & 0.27
\end{tabular}}

\end{document}

Answer 2

Those [0.2cm] are responsible for the wrong vertical alignment. You could remove those and use \arraystretch instead, such as

\renewcommand*{\arraystretch}{1.4}

If you do that within the center environment, the effect will be local, i.e. it will not affect the rest of the document. Here, used after \begin{center} its effect ends with the environment by \end{center}.

For horizontal centering you could use >{\centering}m{1cm} or even better, use Herberts suggestion requiring ragged2e.

Further suggestions:

• Use the booktabs package for better spacing and improved customizable horizontal lines

• Avoid vertical lines, they make reading harder

• Align at decimal points instead of centering, for example using siunitx, rccol or dcolumn