mean:
  density: 0.7736314810886709
  velocity:
  - -6.003551283192742e-06
  - -1.688034866445325e-05
  - -4.4674148597801415e-06
std:
  density: 0.26884296492545257
  velocity:
  - 0.008225206947696545
  - 0.008185755575811615
  - 0.013937436422986439