import ROOT,random

hist=ROOT.TH1D('hist','hist',100,-10,10)
hist2=ROOT.TH1D('hist2','hist2',100,-10,10)
hist2.SetLineColor(ROOT.kRed)

for i in range(10000):
    val=random.gauss(0,2)
    hist.Fill(val)
    hist2.Fill(val*0.5)

hist.Draw()
hist2.Draw('same')

u=raw_input('done?')