void errortest(){
  TH1F *h = new TH1F("h","",10,0,10);

  h->SetFillColor(kBlue);
  h->SetFillStyle(3018);
  h->SetLineColor(kRed);

  for(int i=0; i<9; i++){
    h->Fill(i,i*0.5);
  }

  /*try this first, you
    see it will fill the 
    whole histogram with
    blue*/
  //h->Draw("e2");
  //h->Draw("hist same");
  

  /*if i instead try the opposite
    I get back to where I was 
    where the whole histogram is filled*/
  h->Draw("hist"); 
  h->Draw("e2same");
 

  /*then try this instead,
    you see only the error band is 
    blue, and this is what I want
    but in addition
    I want the line of the histogram 
    showing, but this just 
    gives me the two cases above*/
  //h->Draw("e2");

}