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transverse structural periods are 200 to 325 as compared to approximately 115 Á. (II).System II is also distinctive in that the apparent calculated spacings change with the cosine of the angle of departure of the muscle axis from perpendicularity to the X-ray beam, indicating that the diffracting elements are two-dimensional. Type I elements are also believed to have a thin dimension,2 but apparently this is not fine enough to result in the corresponding diffraction phenomenon.

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