Seems like this is a problem in TGraph::Draw() and it has nothing to do
with I/O. If you were using gr->Draw("ALP") you'd see the whole graph.
Alternatively if you put gr->Draw() in your macro w/o option parameter,
you'll see only one line....
Regards, Pasha.
> // gerrors.C
> {
> gROOT->Reset();
> TFile *fout=new TFile("graph.root","recreate");
> c1 = new TCanvas("c1","A Simple Graph with error bars",200,10,700,500);
>
> c1->SetFillColor(42);
> c1->SetGrid();
> c1->GetFrame()->SetFillColor(21);
> c1->GetFrame()->SetBorderSize(12);
>
> Int_t n = 10;
> Float_t x[n] = {-0.22, 0.05, 0.25, 0.35, 0.5,0.61,0.7,0.85,0.89,0.95};
> Float_t y[n] = {1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1};
> Float_t ex[n] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05};
> Float_t ey[n] = {.8,.7,.6,.5,.4,.4,.5,.6,.7,.8};
> gr = new TGraphErrors(n,x,y,ex,ey);
> gr->SetTitle("TGraphErrors Example");
> gr->SetMarkerColor(4);
> gr->SetMarkerStyle(21);
> gr->Draw("ALP");
> gr->Write("gr");
>
> c1->Update();
> delete fout;
> }
>
>