/UNDERLINE
       /NOUNDERLINE (default)

    Controls whether the underlining specified in chapter and header
    titles in the input file appears in the table of contents.

    If you specify the /UNDERLINE qualifier, the text flagged for
    underlining in the body of the document is underlined in the
    table of contents.

    If you specify the /NOUNDERLINE qualifier, the text flagged for
    underlining in the body of the document is not underlined in the
    table of contents.