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Performance of cross-dispersion option

The wavelength coverage provided by the cross dispersion option depends on the physical size of the detector; it is given in Table 3.3. The current generation of CCD detectors are too small to cover the wavelength range at once, though it is usually possible to cover most important emission lines by a careful choice of grating angle.

The measured efficiency of echelle and the cross-disperser is discussed in Section 3.1.1.

Wed Apr 6 22:56:39 BST 1994