Displays the offset field, the length field, or both from the
    line index indicated by n. For example, if you enter DISPLAY
    INDEX 3 OFFSET, the offset address field from the fourth line
    index is displayed. If you enter DISPLAY INDEX 3 LENGTH, the
    length field from the fourth line index is displayed. If you
    enter either DISPLAY INDEX 3 or DISPLAY INDEX 3 *, both the
    offset and the length fields from the fourth line index are
    displayed.