ColumnAlignments

ColumnAlignments is an option for GridBox which specifies how entries in each column should be aligned.

The following settings can be given:

Lists of settings are used cyclically if there are more columns in the grid than elements in the list.

With the setting ColumnAlignments->"c" a column will be right justified if the character c appears nowhere in it.

You can insert invisible \[AlignmentMarker] characters in the entries in a grid to specify how these entries should be aligned.

See The Mathematica Book: Section 2.8.11.

See also: RowAlignments, ColumnsEqual, TableAlignments, TextAlignment.