//----------------
// AddStandardLabels
//----------------
void AddStandardLabels(TH2D *axes=NULL)
{
	// This will draw a label or two on the
	// current plot using the NDC coordinates.
	// It is put here to make sure all plots have
	// a consistent labeling.
	
	// Date, Author
	TLatex *lab = new TLatex(0.7, 0.71, "July 10, 2009 DL");
	ConvertFromNDC(lab, axes);
	lab->SetTextSize(0.03);
	lab->SetTextAlign(33);
	lab->Draw();

	// Revision
	lab = new TLatex(0.7, 0.67, "release-2009-05-27");
	ConvertFromNDC(lab, axes);
	lab->SetTextSize(0.025);
	lab->SetTextAlign(33);
	lab->Draw();

	// Type
	lab = new TLatex(0.7, 0.63, "Single #pi^{+}, 0.5GeV/c  -- FULL Reconstruction");
	ConvertFromNDC(lab, axes);
	lab->SetTextSize(0.03);
	lab->SetTextAlign(33);
	lab->Draw();

	// Spoiled field
	lab = new TLatex(-0.55, 0.63, "Magnetic field spoiled by 1% in R,#theta,#phi");
	ConvertFromNDC(lab, axes);
	lab->SetTextSize(0.03);
	lab->SetTextAlign(13);
	lab->Draw();
}

//----------------
// ConvertFromNDC
//----------------
void ConvertFromNDC(TLatex *obj, TH2D *h=NULL)
{
	// Bugs in ROOT make it hard to plot labels consistently.
	// For 1D plots, the histogram axes define the coordinate
	// system. For 2D plots, we seem to be forced to use the
	// NDC. There does not seem to be an obvious way to tell
	// which we're using so we pass the information in in the
	// form of the "axes" histogram. If it is not NULL, then
	// we use it to define the limits. Otherwise, we do nothing.

	if(h==NULL)return;

	TAxis *xaxis = h->GetXaxis();
	int Nbinsx = xaxis->GetNbins();
	double xmin = xaxis->GetBinLowEdge(1);
	double xmax = xmin + xaxis->GetBinLowEdge(Nbinsx);

	TAxis *yaxis = h->GetYaxis();
	int Nbinsy = yaxis->GetNbins();
	double ymin = yaxis->GetBinLowEdge(1);
	double ymax = yaxis->GetBinLowEdge(Nbinsy);
	
	
	double x = obj->GetX();
	double y = obj->GetY();
	
	x = xmin + (xmax-xmin)*(0.5+x/1.15);
	y = ymin + (ymax-ymin)*(0.5+y/1.15);
	
	obj->SetX(x);
	obj->SetY(y);

}