Describes the amount of white space that should be preserved at the end of each column. This space appears between the end of the data and the beginning of the next column. The column divider, if any, appears in the region. This space is expressed as tenths of the standard font width. For example, a value of 5 indicates a half-character width.
Each time you set this property, you set the separation amount for the next column in the grid, starting with the first. Setting this property to -1 clears the previously specified separation amounts. The default separation used for unspecified columns is set by the COLUMN-SEPARATION configuration variable. This defaults to 5.