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Table 1
Key design parameters.
| Parameter | Value | Comment |
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| λ blaze | 15 Å | first order blaze wavelength |
| δ | 0.6989° | blaze angle of facets |
| γ | 2.2751° | graze angle on facets |
| α | 1.5762° | angle of incidence |
| β blaze | 2.9739° | diffraction angle for λblaze |
| 1 /d | 645.6 lines/mm | central groove density |
| CCDs | 9 | back illuminated, ~30 μm thick |
| Pixels | 27 × 27 μm2 | pixel size; standard 3 × 3 on chip binning |
| CCD size | 1024 × 384 | image area, identical storage area |
| T | − 80 to –110°C | |
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| λ-range | 6.0–38 Å | |
| A eff | 140 cm2 | for two units at 15 Å |
| Resolving power | 100–500 | ≈250 at 15 Å |
| Δλ | 8 mÅ | wavelength accuracy |
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