The .HEADERS ON and .NO HEADERS commands restore and cancel,
    respectively, the capability of having one or two lines of
    information at the top of a page. These lines indicate the
    content of the page and the page number. They are called running
    heads, which you should not confuse with section heads (specified
    with .HEADER LEVEL commands).

    Formats

      .HEADERS [ON]

      .NO HEADERS

    Abreviated formats

      .HD [ON]

      .NHD

      .HD

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