Fig 4. (a) Values of the arcsine function and (b) an example for transformation of ΩΔτ and $\Omega \tilde{\tau }$.

(a) Blue for arcsin(x) ∈ [−π/2, π/2] and red for arcsin(x) ∈ [π/2, 3π/2] in the Cartesian plane. (b) Values of Ωτ_1,2 (black) and ΩΔτ and $\Omega \tilde{\tau }$ (red), and ΩΔτ* = ΩΔτ ± π and $\Omega {\tilde{\tau }}^{*}=\Omega \tilde{\tau }\pm \pi$ (blue), which appear due to the summation sin(Ωτ₁ + ϕ_i) + sin(Ωτ₂ + ϕ_i + 2π).