void test(){

	TF1 *F = new TF1("F","gaus"); 
	
	TF1 *Fn; 
	TF1 *Final; 
	
	double sigma=1; 
	
	for(int i=0; i<1000; i++){
	
		F->SetRange(-1,1);
		
		F->SetParameter(0,1); 
		F->SetParameter(1,0); 
		F->SetParameter(2,sigma); 
		
		if(i==0) {
			Fn=(TF1*)F->Clone(Form("F%d",i));
			continue;
		}
		
		TF1 *sum = new TF1("sum",Form("F%d+F",i-1)); 
		
		Fn=(TF1*)sum->Clone(Form("F%d",i)); 
		delete sum; 
		if(i==999) Final=(TF1*)Fn->Clone("F_final"); 
		
		if(i%100==0) cout << "Event: " << i << endl; 
		
		sigma-=0.0001; 
		
	}
	Final->Draw();
	//Final->Print();
}