“…The response function is dened as average function of Poisson process π
π (π‘; π, π, πΈ) for point source event πΏ(Γ¬ π, πΈ). As the result of energy linearity, we can extract the energy πΈ from intensity function π
π (π‘; π, π, πΈ) = πΈ π
π (π‘; π, π), (1) then we use polynomials to express π
π (π‘; π, π)…”