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Areas of projection of parent segment G′A (I, IIa, IIb, III, IVa, and IVb, respectively) in the daughters’ plane to be distinguished for the transformation rules of the azimuth angle φ (see text). AE and AF are the daughter segments of a spatial bifurcation. ρ is the intermediate angle, and σ and τ are the side angles of the spatial bifurcations, see Figure 1B.
