v 2.15

E_{0 Σ} = (E_{01} + E_{02} \cos δ)^{2} + (E_{02} \sin δ)^{2} = E_{01}^{2} + E_{02}^{2} + 2 E_{01} E_{02} \cos δ

${E_{0 \Sigma}= (E_{01} +E_{02} \cos \delta)^2 + (E_{02} \sin \delta )^2 = E_{01}^2 + E_{02}^2+2 E_{01} E_{02} \cos \delta}$

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