{
   TString unit("m/s");
   
   TCanvas* c = new TCanvas();
   
   TPaveText* pt = new TPaveText(0.05, 0.05, 0.95, 0.95, "NDC");
   
   pt->AddText(Form("(1) c = %e %s", TMath::C(), unit.Data()));
   pt->AddText(Form("(2) c = %.4e %s", TMath::C(), unit.Data()));
   pt->AddText("Where are the Units in (2)?");
   
   pt->Draw();
}