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Slit name Slit width
Slit length
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).