The .SPACING command changes the amount of spacing between lines
    of text.

    Format

      .SPACING  n

    Abreviated format

      .SP  n

1 - Parameter

 n

    The amount of spacing that you want between lines of text. For
    example, 1 denotes single spacing (no blank lines between lines
    of text). You must specify n, which must be within the range of 1
    to 5, inclusively.

2 - Default

    If you do not enter a .SPACING command, you get single spacing
    (.SPACING 1).