* Fitting Systems of Linear Differential Equations;

data sulfate;



   t      y

 -----------

   2    151.1

   4    113.6

   6     97.7

   8     90.9

  10     84.8

  15     76.9

  20     73.3

  25     70.6

  30     67.0

  40     64.3

  50     61.6

  60     59.9

  70     57.7

  80     56.4

  90     53.9

 110     50.9

 130     48.7

 150     46.0

 160     45.0

 170     43.6

 180     42.7