void DWeights(int ip=0) {
  TCanvas *c1(new TCanvas());

  TFile::Open("SimAnalysisLayerTracks900066.root");

  gStyle->SetOptStat(0);

  DWeightsNaive->SetLineColor(2);
  DWeightsNaive->SetTitle(";Layer;Weight w_{i} (GeV)");
  DWeightsNaive->GetYaxis()->SetRangeUser(0,0.07);
  DWeightsNaive->GetYaxis()->SetTitleOffset(1.3);

  DWeightsNaive->Draw("hist");
  if(ip>0) {
    DWeightsOpt->SetLineColor(4);
    DWeightsOpt->Draw("hist same");
  }
  c1->Update();
  if(ip==0) c1->Print("DWeights0.png");
  if(ip> 0) c1->Print("DWeights1.png");
}