{
    TNtuple *n1 = new TNtuple("n1","a n-tuple","x:y:z:alpha:beta:gamma");
    
    TRandom3 rnd;
    
    float var[6];
    for(int i=0;i<10000;i++) {
        var[0] = rnd.Uniform(0.,1);
        var[1] = rnd.Gaus(0.,1.);
        var[2] = rnd.Exp(-1.);
        var[3] = var[0]*var[1];
        var[4] = var[0]*var[2];
        var[5] = var[0]*var[1]*var[2];
        
        n1->Fill(var);
    }
}