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Al,
I like your analysis!
Basically I think you're correct, but I'd add in a couple of "real life" variables....
The image on the SA will always be controlled by the seeing conditions, over here its got to be very good to get much below 4 sec star images, and that's for the faint stars; the brighter ones are "bloated"
Also, the larger the out of focus star image on the SA grating, the more lines are illuminated and the better the resolution. Add these to the dispersion and you may get different results???
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