| http://www.w3.org/ns/prov#value | - Like the emitter area 22, each of the inner surface(s) 32, upstream aperture 34 a and downstream aperture 36 a is preferably substantially centered on the major axis X. As illustrated in FIG. 4, the inner surface(s) 32 of the collimator may have a generally curved shape, such as a parabolic, hyperbolic, elliptical or spherical shape.
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