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Slits
| Slit name | Slit width (arcsec) |
Slit length (arcsec) |
Approximate Resolving power |
| 2 pixels | 0.17 | 14 | 80,000 |
| 3 pixels | 0.25 | 14 | 65,000 |
| 4 pixels | 0.34 | 14 | 50,000 |
Slit orientation: with Phoenix on port 4 and the default Cassegrain rotator angle of 90 degrees, the slit orientation is East-West and higher column numbers are to the east (to the right on the Phoenix display). Wavelength increases to lower numbered pixels (downward on the display).