void main()
{
	// Put data into different datasets	
	TGraphErrors gr[24]; 
	for (int i=0; i<24; i++)  gr[i] = new TGraphErrors();
	for (int i=0; i<24; i++) 
	{
		for (int j=0; j<10; j++)
		{
			gr[i].SetPoint(j,j,j*1.2);
		}
	}
	gr[4].Draw("A*");
	cout<<gr[4].GetN()<<endl;
	for (int i=0; i<gr[4].GetN(); i++)
	{
		double x1, x2, x3; gr[4].GetPoint(i,x1,x2);
		cout<<x1<<"\t"<<x2<<endl;
	}
}