In an embodiment, a method determines a three-dimensional model from a plurality of images taken of a geographic region by one or more cameras from different perspectives. As unmodified PA poorly adheres to the fluoropolymers often used as the material for the fiber cladding, the plastic optical fiber moves in relation to the protective sheathing when the temperature varies. Two or more of the subsets have one or more data vectors in common, but also have one or more data vectors, in one or more of the subsets, that are not in other subsets. The shims of the legs of the supplemental seal are slit along their distal margin and staggered in a chord-wise direction relative to one another to provide flexibility and effective sealing engagement with the nozzle support ring.