The .RIGHT MARGIN command sets the right margin to the position
    that you specify. This is the position to which a line of text
    normally extends. If .JUSTIFY is in effect, the .RIGHT MARGIN
    value is the position against which text is justified. If .NO
    JUSTIFY is in effect, the .RIGHT MARGIN value specifies the
    maximum number of characters on any text line. (Compare with
    .PAGE SIZE, which sets the page width for running heads.)

    Format

      .RIGHT MARGIN  [[+/-]n]

    Abreviated format

      .RM  [[+/-]n]

1  –  Parameters

 n

    Specifies the character position of the new right margin; n must
    be greater than the value for the left margin. (For example,
    .RIGHT MARGIN 60 sets the right margin just to the right of the
    60th character position.) The maximum value of n is 150.

 +n

    Sets the right margin n character positions to the right of the
    current right margin.

 -n

    Sets the right margin n character positions to the left of the
    current right margin.

2  –  Defaults

    o  If you do not enter the .RIGHT MARGIN command, you get .RIGHT
       MARGIN 70.

    o  If you enter .RIGHT MARGIN without a value, you get the
       default value 70.