ABAQUS Volume II: I–Z - Manual (Page 25)

*IMPEDANCE
8. X-component of the direction cosine of the major axis of the ellipse or prolate spheroid defining
the radiating surface. The components of this vector need not be normalized to unit magnitude.
9. Y-component of the direction cosine of the major axis of the ellipse or prolate spheroid defining
the radiating surface.
10. Z-component of the direction cosine of the major axis of the ellipse or prolate spheroid defining
the radiating surface.
9.1–3
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