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We prove that if $X$ is a symmetric space of the noncompact type, just asadding Helgason waves which propagate in all direction yields an elementaryspherical function for $X$, a Helgason wave can be produced by addingelementary spherical functions whose centers cluster along a horocycle in $X$.

Un effet de moir\'e sur les espaces sym\'etriques de type non-compact