Figure A1.
The velocity precision of the wavelength solution achieved by Keck/HIRES after distortion correction for the echelle order with sodium. Each data point is the average wavelength shift in all the clean absorption line in an exposure.

The velocity precision of the wavelength solution achieved by Keck/HIRES after distortion correction for the echelle order with sodium. Each data point is the average wavelength shift in all the clean absorption line in an exposure.

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