int representing the line spacing for a paragraph.
spacingThe value for the spacing. The units depend on the type parameter.
typeThe type of spacing to use. See SpacingRule for a discussion on the different types of spacing.
There are three types of line spacing: AtLeast, Exactly, and Multiple. AtLeast and Exactly are set in twips. One twip = (1/20 pt) or (1/1440 in). Multiple is set in number of lines. AtLeast must be between 0 pt (0 twips) and 1584 pt (31680 twips). Exactly must be between 0.7 pt (14 twips) and 1584 pt (31680 twips). Multiple must be between 1 line and 132 lines. Values beyond these for all 3 types will be adjusted automatically.
MS Word equivalent: Format menu > Paragraph... > Indents and Spacing > Spacing section > At: