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\param[out] rz z coordinate of the product vector inline void crossdiv ( real v1x , real v1y , real v1z , real v2x , real v2y , real v2z , real j , real & rx , real & ry , real & rz ) { cross ( v1x , v1y , v1z , v2x , v2y , v2z , rx , ry , rz ); rx /= j ; ry /= j ; rz /= j ; } //!