columnalign="left"
$\begin{array}{ccc}\text{123}& \text{123}& \text{123}\\ \text{12345}& \text{12345}& \text{12345}\\ \text{1234567}& \text{1234567}& \text{1234567}\end{array}$
columnalign="center"
$\begin{array}{ccc}\text{123}& \text{123}& \text{123}\\ \text{12345}& \text{12345}& \text{12345}\\ \text{1234567}& \text{1234567}& \text{1234567}\end{array}$
columnalign="right"
$\begin{array}{ccc}\text{123}& \text{123}& \text{123}\\ \text{12345}& \text{12345}& \text{12345}\\ \text{1234567}& \text{1234567}& \text{1234567}\end{array}$