ColumnSpacings

ColumnSpacings is an option for GridBox which specifies the spaces in ems that should be inserted between adjacent columns.

The default setting is ColumnSpacings->0.8.

ColumnSpacings effectively specifies the minimum distance between entries in adjacent columns; individual entries will often not fill their columns and will therefore be further apart.

ColumnSpacings->n uses a column spacing equal to n times the current font size—usually about n times the width of an M in the current font.

ColumnSpacings->, , ... can be used to specify different spacings between different columns. If there are more columns than entries in this list, then the last element of the list is used repeatedly for the remaining columns.

See The Mathematica Book: Section 2.8.11.

See also: ColumnAlignments, ColumnWidths, ColumnsEqual, RowSpacings, TableSpacing.