The value of vertical spacing between rows of a matrix; If the RowGapRule is set to 3 ("Exactly"), then the unit is interpreted as twips (1/20th of a Point) If the RowGapRule is set to 4 ("Multiple"), then the unit is interpreted as half-lines. Default: 0...interpreted as twips (1/20th of a point) If the RowGapRule is set to...