CSHELL's spectral resolving power has been restored to about R=40,000 matched to the 0.5 arcsec-wide slit. This was done by moving the spectrograph array to refocus the spectrum. The most likely cause of the internal focus change is a change in flatness of the aluminum grating due to a decade of occasional thermal cycling. CSHELL was warmed up and fixed during fall 2001.

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John Rayner (rayner@irtf)
Last modified 10 Spetember 2001