Why do we select proton or iron as our UHECR candidates?

1. Proton and Iron are very common in our universe.
2. Iron has the highest binding energy among heavier nuclei, in other words, they are hard to break up in the GZK process.
3. There might be some other elements blow GZK threshold, but these two are kind of the limit.

Root set thstack axis title

First, do this
stack->Draw("nostack");
Then this
    stack->GetXaxis()->SetTitle("Timebins");
    stack->GetYaxis()->SetTitle("Signal(VEM)");
If you do not follow this order, you get error, stupid root!

Red line in root canvas

#include "TStyle.h"

gStyle->SetFillColor(kWhite);
gStyle->SetCanvasBorderMode(0);
gStyle->SetFrameBorderMode(0);

candidate events data path

/nfs/data/ADST_DATA/double_shell_candidates/Interesting_2006

Program path

prog2009/Oct/prog1028/

Root set canvas white

c1 = new TCanvas("c1","Dynamic Filling Example",200,10,700,500);

c1->SetFillColor(kWhite);

Put histogram white
gStyle->SetFillColor(kWhite);