{
  
  Float_t leftmargin  = 0.1;
  Float_t rightmargin = 0.13;
  Float_t topmargin   = 0.0;
  Float_t titleoffset = -1.;

  Float_t radius      = 0.5;
  Float_t innerradius = 0.1;
  Float_t x0          = 0.05;
  Float_t y0          = 0.03;
  Float_t low         = -1.;
  Float_t high        = 1.;
  Int_t   nbins       = 50;

  Float_t width = (high - low)/2.;

  gStyle->SetOptStat(0000);
  gStyle->SetOptFit(0000);
  gStyle->SetOptTitle(0);
  gStyle->SetPadColor(0);
  gStyle->SetCanvasColor(0);
  gStyle->SetStatColor(0);
  gStyle->SetTitleColor(1);
  gStyle->SetPadBorderMode(0);
  gStyle->SetFrameBorderMode(0);
  gStyle->SetCanvasBorderMode(0);
  gStyle->SetPalette(18,0);
  gStyle->SetPaperSize(20,26);
  gStyle->SetPadLeftMargin(leftmargin);
  gStyle->SetPadRightMargin(rightmargin);
  //gStyle->SetPadTopMargin(topmargin);

  TH2F *proj = new TH2F( "proj", "", nbins, low, high, nbins, low, high );
  proj->SetOption("contz");
  proj->GetXaxis()->SetTitle("x (cm)");
  proj->GetYaxis()->SetTitle("y (cm)");
  proj->GetYaxis()->SetTitleOffset(titleoffset);
  
  TCanvas *cproj = new TCanvas("cproj","",500,500);

  TArc *circ = new TArc(x0,y0,radius);
  circ->SetLineWidth(2);
  circ->SetLineColor(38);

  TArc *incirc = new TArc(x0,y0,innerradius);
  incirc->SetLineWidth(2);
  incirc->SetLineColor(38);

  TLine *lbot = new TLine(x0,low,x0,y0-radius);
  lbot->SetLineWidth(2);
  lbot->SetLineColor(38);

  TLine *ltop = new TLine(x0,high,x0,radius+y0);
  ltop->SetLineWidth(2);
  ltop->SetLineColor(38);

  TLine *lright = new TLine(low,y0,x0-radius,y0);
  lright->SetLineWidth(2);
  lright->SetLineColor(38);

  TLine *lleft = new TLine(high,y0,x0+radius,y0);
  lleft->SetLineWidth(2);
  lleft->SetLineColor(38);

  proj->Draw();
  circ->Draw();
  incirc->Draw();
  lbot->Draw();
  ltop->Draw();
  lright->Draw();
  lleft->Draw();

}