The nominal and rotated filter wheel positions for the redshifted [OII] quad filter are each associated with different filter names. This allows pipeline calibration and database retrievals to proceed smoothly. The filter names are summarized in Table 3.9.
The required central wavelength is selected by filter name and aperture location. Filter element FQUVN (Filter Quad UltraViolet Narrow) has three possible apertures, each of which is nominally centered in one of the three WF channels and associated with a unique central wavelength. The filter element FQUVN33 corresponds to a single central wavelength. In addition to the filter name and aperture, a central wavelength is also requested in the proposal instructions in order to provide a consistency check. Aperture names are discussed further in section 3.9, "Apertures", on page 56.
Table 3.9: Redshifted [OII] Quad Filter Elements.