vel-x  vel-y     x       y
0.5     0.0     0.0     0.0
0.5     0.3     4.0     0.0
0.2    -0.4     1.0     1.0
0.3     0.0     3.0     1.0
0.3     0.1     2.0     2.0
0.5     0.0     4.0     2.0
0.4     0.0     0.0     3.0
0.4    -0.3     2.0     3.0
0.7    -0.3     3.0     3.0
0.2    -0.6     5.0     3.0
