Equation Icon  ( ) F+ = 1-1 + cos2 𝜃 cos2 ϕcos 2ψ − cos𝜃 sin 2ϕ sin 2ψ, 2 1( 2 ) F× = 2 1 + cos 𝜃 cos2 ϕsin2 ψ + cos𝜃 sin 2ϕ cos2ψ. (57 )