| http://www.w3.org/ns/prov#value | - Dark field, first order diffraction interferometer imaging systems are less susceptible (Kirk '87 above) to inaccuracies caused by asymmetry of the kind shown in FIGS. 1, 2.: but these methods have other difficulties of their own, making a bright field illumination system desirable in some applications, such as grainy metals and the like.
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