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double x[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
double y[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
TGraph g(10, x, y);
TF1 f1("f",[&](double *x, double *){ return g.Eval(x[0]);}, 1, 10, 0);
double integral = f1.Integral(1, 10);