| http://www.w3.org/ns/prov#value | - Thus, the hole-containing region has holes disposed in silica, the silica being essentially pure or doped with one or more dopants, such that the hole-containing region has holes with a refractive index much lower than silica, and moreover the region is a heterogeneous region comprised of undoped or doped silica and holes (empty or gas filled) that has an effective refractive index that includes t
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