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I don't know a lot about the SGS, but it looks to me like the slit is full sensor height. Guiding on a star, the appropriate spectrum is easy to identify, but you might experience some interesting challenges with spectra from the limb of the sun... I guess you just go for the maximum red or blue shift, is that the plan? Otherwise the spectrum should be full sensor height, with various red/blue shifts in the Y direction...
Al.
Last edited by sheeny; 02-09-2014 at 09:38 PM.
Reason: typo
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