{
#include <fstream.h>
double emu, enu;
pinu = new TH1F("pinu","nneutrinos from pions",105, 0.,21.0);
Knu = new TH1F("Knu","neutrinos from Kaons",105,0.,21.0);
//
ifstream fin("pimu_1.txt");
while (fin >> emu >> enu )  pinu->Fill(enu);
fin.close();
//
ifstream fin("Kmu_1.txt");
while (fin >> emu >> enu )  Knu->Fill(enu);
fin.close();
//
pinu->SetXTitle("Energy (GeV)");
pinu->SetLineColor(2);
pinu->Draw();
Knu->SetLineColor(4);
Knu->Draw("SAME");
//
leg = new TLegend(0.55 ,0.8 ,0.9,0.9);
leg->AddEntry(pinu,"neutrinos from #pi decay","l");
leg->AddEntry(Knu,"neutrinos from K decay","l");
leg->SetFillColor(10);
leg->SetBorderSize(0); 
leg->Draw();
//
c1->Print("piKnu.png");
}