datetime: 25-Apr-2024 11:51:47
1 3.201000e-01 2.223000e-01
1.568000e-01 1 3.700000e-01
1.095000e-01 4.000000e-01 1

mean velocity (unclean): 3.486188e+01 
mean velocity (clean): 1.678818e+02