.Modelica.Mechanics.MultiBody.Examples.Elementary.PointGravityWithPointMasses2.SystemWithStandardBodies.PointMass .Modelica.Mechanics.MultiBody.Examples.Elementary.PointGravityWithPointMasses2.SystemWithStandardBodies.PointMassBody used at all places of the comparison model with zero inertia tensor (and mass = 1 kg and a red color).
model PointMass = Modelica.Mechanics.MultiBody.Parts.Body(final m = 1, final r_CM = {0, 0, 0}, final I_11 = 0, final I_22 = 0, final I_33 = 0, final I_21 = 0, final I_31 = 0, final I_32 = 0);