#include "TTree.h"
#include "TFile.h"

void try27() {
// open ROOT file 
	TFile *ftree = new TFile("tree_nucnet27.root", "recreate");

// creation of the first TTree
	TTree *expo = new TTree("exposure", "");
// creation and filling of branches to hold the variables
	expo->ReadFile("exposure.txt", "sequence/F:Exposure");
// Write, Scan and Print the Tree
	expo->Write();	
	expo->Scan();
	expo->Print();
// creation of the secound TTree
	TTree *fe = new TTree("fe", "");
// creation and filling of branches to hold the variables
	fe->ReadFile("fe.txt", "sequence/F:fe56:fe57:fe58");
// Write, Scan and Print the Tree
	fe->Write();
	fe->Scan();
	fe->Print();

expo->AddFriend(fe);

expo->Draw("fe56:Exposure", "fe56 > 0", "L");
expo->Draw("fe57:Exposure", "fe57 > 0", "L SAME");
expo->Draw("fe58:Exposure", "fe58 > 0", "L SAME");

}