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Two collimators are available; the large one is used with gratings A and B, and the small collimator is used with gratings C, D, echelle, and any of the RC gratings. The large collimator has the advantage of higher demagnification, allowing a wider slit width for the same resolution on the detector. The specifications of both collimators are given in table 4.
Table 4: Coude spectrograph collimators