The .CENTER (.CENTRE) command centers a single line of text
    around a character position on a line (compare with .RIGHT).

    Formats

      .CENTER  [[+/-]n]; text

      .CENTER  [[+/-]n] text

      .CENTRE  [[+/-]n]; text

      .CENTRE  [[+/-]n] text

    Abreviated formats

      .C  [[+/-]n]; text

      .C  [[+/-]n] text