{
   TCanvas* helix_example_c1 = new TCanvas("helix_example_c1");
   TView *view = TView::CreateView(1);
   view->SetRange(-1,-1,-1,1,1,1);
   THelix *helix = new THelix(0., 0., 0., 1., 0., 0.3, 10.);
   helix->Draw();
}