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Steven,
The improved SNR helps but the inherent resolution of the grating set-up will not change. If you get say 20A resolution with your set-up (grating to camera distance/ pixel size etc.) then that's the wavelength accuracy you'll obtain...
Subject to atmospheric effects.... if nothing changes then your response curve should still be valid.
Drop me your fits files and I can verify.
Also, just double check with an A type star.....
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