Steven,
4 hrs is a lot of exposure!! Well done!
The SNR has improved but the resolution will remain the same.....
(Buil quotes 3C273 at Z=0.15834 so you're on the money!)
Eta Car and gamma2 vel should be on your list....
A similar exposure on a slit spectrograph of some of our SASER targets would definitely be very well regarded....
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