Returns or sets an
int that represents the default spacing between a table's cells that has this formatting. This is the distance in twips between the edge of a cell and the center of its border with an adjacent cell. One twip = (1/20 pt) or (1/1440 in)
By default, this is set to zero (0) for a new table.
Word equivalent: Table menu > Table Properties... > Table tab > Options... button > Default cell spacing section > Allow spacing between cells