data fw06p10; title 'CHAPTER 6, PROBLEM 10, NITROGEN RATES';
input  NIT    YIELD ;
cards;
  40      42
  40      41
  40      40
  80      45
  80      45
  80      44
 100      46
 100      48
 100      46
 160      49
 160      45
 160      43
 200      50
 200      44
 200      45
 240      46
 240      45
 240      45