X    Y
   50  4184.0
   50  4711.0
   50  3683.0
  100  4690.0
  100  5086.0
  100  5382.0
  200  6944.0
  200  6312.0
  200  5689.0
  400  5912.0
  400  5777.0
  400  6725.0