TString dir = gROOT->GetTutorialDir();

TFITSHDU hdu(dir + "/fitsio/sample2.fits");

hdu.Print("F+");

std::unique_ptr<TVectorD> Y(hdu.GetArrayRow(0));
std::unique_ptr<TVectorD> X(hdu.GetArrayRow(1));
TGraph gr(*X,*Y);

auto c = new TCanvas("c1", "FITS tutorial #2", 800, 800);
gr.SetFillColor(kRed);
gr.DrawClone("BA");

gROOT->GetListOfCanvases()->Draw()