#include <iostream>
#include <TGraphErrors.h>
#include <TCanvas.h>

int main()
{
	double x[10] = {0,1,2,3,4,5,6,7,8,9};
	double y[10] = {1,2,3,4,5,5,4,3,2,1};

	TCanvas *canv = new TCanvas("c2","c2",600,400);
	canv -> SetGrid();
	TGraph *g = new TGraph(10, x, y);
	g->SetMarkerStyle(20);
	g->SetMarkerColor(2);
	g->Draw();
	canv -> SaveAs("test.pdf");
	return 0;
}