python3 -m fmpy simulate  --output-file Modelica_3.2.3_Modelica.Mechanics.MultiBody.Examples.Elementary.UserDefinedGravityField_res.csv --start-time 0 --stop-time 10 --timeout 50 --relative-tolerance 1e-08 --interface-type ModelExchange --solver CVode --output-interval 0.004 Modelica_3_2_3_Modelica_Mechanics_MultiBody_Examples_Elementary_UserDefinedGravityField.fmu