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. Le-tenseur, k les indices de trois coordonnées cartésiennes (x, y, z). Sous I'action d'un champ électrique, il peut avoir à la fois, en général, une variation de I'amplitude et de la direction des axes principaux du tenseur. Les effets EO décrivant la relation entre cette perturbation de I'ellipsoïde des indices ÂB;; et le champ électrique appliqué