{ TH1F *h = new TH1F("h", "Beta", 150, 150., 300.); h->SetBinContent(52,600); h->SetBinContent(53,662); h->SetBinContent(54,622); h->SetBinContent(55,584); h->SetBinContent(56,633); h->SetBinContent(57,614); h->SetBinContent(58,622); h->SetBinContent(59,597); h->SetBinContent(60,589); h->SetBinContent(61,595); h->SetBinContent(62,615); h->SetBinContent(63,604); h->SetBinContent(64,607); h->SetBinContent(65,601); h->SetBinContent(66,588); h->SetBinContent(67,643); h->SetBinContent(68,584); h->SetBinContent(69,603); h->SetBinContent(70,642); h->SetBinContent(71,671); h->SetBinContent(72,682); h->SetBinContent(73,692); h->SetBinContent(74,724); h->SetBinContent(75,768); h->SetBinContent(76,742); h->SetBinContent(77,812); h->SetBinContent(78,837); h->SetBinContent(79,885); h->SetBinContent(80,881); h->SetBinContent(81,950); h->SetBinContent(82,1007); h->SetBinContent(83,1056); h->SetBinContent(84,1093); h->SetBinContent(85,1161); h->SetBinContent(86,1310); h->SetBinContent(87,1456); h->SetBinContent(88,1546); h->SetBinContent(89,1265); h->SetBinContent(90,1227); h->SetBinContent(91,1213); h->SetBinContent(92,1062); h->SetBinContent(93,1027); h->SetBinContent(94,947); h->SetBinContent(95,964); h->SetBinContent(96,817); h->SetBinContent(97,733); h->SetBinContent(98,780); h->SetBinContent(99,737); h->SetBinContent(100,714); h->SetBinContent(101,704); h->SetBinContent(102,693); h->SetBinContent(103,714); h->SetBinContent(104,604); h->SetBinContent(105,534); h->SetBinContent(106,487); h->SetBinContent(107,485); h->SetBinContent(108,445); h->SetBinContent(109,465); h->SetBinContent(110,408); h->SetBinContent(111,372); h->SetBinContent(112,354); h->SetBinContent(113,299); h->SetBinContent(114,298); h->SetBinContent(115,286); h->SetBinContent(116,293); h->SetBinContent(117,267); h->SetBinContent(118,232); h->SetBinContent(119,279); h->SetBinContent(120,221); h->SetBinContent(121,240); h->SetBinContent(122,236); h->SetBinContent(123,230); h->SetBinContent(124,221); h->SetBinContent(125,230); h->SetBinContent(126,197); h->SetBinContent(127,227); h->SetBinContent(128,225); h->SetBinContent(129,206); h->SetBinContent(130,199); h->SetEntries(51015); #if 0 /* 0 or 1 */ TF1 *f = new TF1("f","gaus(0)+gaus(3)+expo(6)", 201., 280.); // note: you MUST set reasonable initial values for all parameters // f->SetParameters(900., 235., 10., 200., 250., 10., 10., -0.02); f->SetParameters(700., 235., 10., 400., 235., 2., 10., -0.02); #else /* 0 or 1 */ TF1 *f = new TF1("f","gausn(0)+gausn(3)+expo(6)", 201., 280.); // note: you MUST set reasonable initial values for all parameters f->SetParameters(2.e4, 235., 10., 2.5e3, 235., 2., 10., -0.02); #endif /* 0 or 1 */ // gStyle->SetOptFit(); // f->Print(); h->Fit(f, "R"); }