The LINAGE clause specifies the number of lines on a logical page.  It
  can also specify the size of the logical page's top and bottom margins
  and the line where the footing area begins in the page body.

  Format -

   LINAGE IS {page-lines} LINES [ WITH FOOTING AT footing-line ]
      [ LINES AT TOP top-lines ] [ LINES AT BOTTOM bottom-lines ]