0  0
  0.2  0
  0.4  0
  0.6  0
  0  2
  0.2  2
  0.4  2
  0.6  2
  0  4
  0.2  4
  0.4  4
  0.6  4
  0  6
  0.2  6
  0.4  6
  0.6  6
  0  8
  0.2  8
  0.4  8
  0.6  8