{
gStyle->SetMarkerStyle(8);
gStyle->SetMarkerSize(.5);

double x[5]={1.0, 2.0, 3.0, 4.0, 5.0};
double y[5];
double z[5];
for(int i=0; i<5; i++){
  y[i]=x[i];
  z[i]=2*x[i];
}

TGraph* g1 = new TGraph(5, x, y);
g1->SetMarkerColor(2);
TGraph* g2 = new TGraph(5, x, z);
g2->SetMarkerColor(4);

TMultiGraph* mg = new TMultiGraph();
mg->Add(g1);
mg->Add(g2);
mg->Draw("ap");

gStyle->SetFuncColor(1);

g1->Fit("pol1");
gPad->Modified();
gPad->Update();
TPaveStats* sb1=(TPaveStats *)(gPad->GetPrimitive("stats"));
sb1->SetX1NDC(.7);
sb1->SetX2NDC(.9);
sb1->SetY1NDC(.2);
sb1->SetY2NDC(.4);
sb1->SetTextColor(2);
sb1->SetName("first_fit");
gPad->Modified();
gPad->Update();

g2->Fit("pol1");
gPad->Modified();
gPad->Update();

TPaveStats* sb2=(TPaveStats *)(gPad->GetPrimitive("stats"));
sb2->SetX1NDC(.2);
sb2->SetX2NDC(.4);
sb2->SetY1NDC(.7);
sb2->SetY2NDC(.9);
sb2->SetTextColor(4);
sb2->SetName("second_fit");
gPad->Modified();
gPad->Update();

}