| http://www.w3.org/ns/prov#value | - FIG. 4 is a graph that has a horizontal axis, which represents the isotropic external pressure P, and a vertical axis, which represents the birefringence B. A relatively thick line represents the function according to which the birefringence varies with the anisotropic external pressure applied to the optical fiber FD. The birefringence has a default magnitude B 0 when a default, atmospheric press
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