An across arrow is intended to traverse one or more rows. When you add or edit an across arrow, you set the following options:
Select whether to Show a label, its font and Background color (if not Transparent).
A label can be centered (anchored) along 3 points in an arrow: Begin, middle and end, and then be aligned along 5 positions relative to the anchor point: Above, center, below, left and right, with further pixel-level adjustments with Offset.
Offset sign follows the directions of the X/Y axis (i.e. positive horizontal offset is to the right, and positive vertical offset is downward).
Label text can include superscript and subscript portions, e.g.:
a""n"" and t..RC..
Superscript text is surrounded by a pair of quotation marks, and subscript text is surrounded by a pair of dots.