n

    The number of blank lines needed. Values of 0 or less are not
    valid and n cannot exceed the number of lines of text allowed
    on a page (this would be the page-length value associated with
    the .PAGE SIZE command minus any header lines, any forced blank
    spaces after the header information, and any bottom of the page
    information specified by .LAYOUT 1, .LAYOUT 2, or .LAYOUT 3).