Section (Fits)
{
  string Type = "zerofit";

  Section (Particle1)
  {
    string Name = "free";
    double lambda = 1.0;
    int Ndim = 3;
  }

  Section (Particle2)
  {
    string Name = "free";
    double lambda = 1.0;
    int Ndim = 3;
  }

  Section (Potential)
  {

  }
}