void customizeHistogram() {
    
    TF1* f1 = new TF1("neg","(1/sqrt([2]))*(-sqrt(x+(([1]*[1])/(4*[2])-[0]))-[1]/(2*sqrt([2])))", -150., 101.);
    f1->SetParameters(-147.973, -45.2714, 661.089);
    TCanvas *c1 = new TCanvas();
    c1->cd();
    f1->Draw();
}