Alignment of the wavelength solution for a single UVES, ESPaDOnS and UES dataset. Top panels: mean shift required to align the absorption lines to their average position. Bottom panels: residual scatter in the line positions. On average, absorption lines are aligned to within 0.1 km s−1 accuracy. The wavelength solution of the UES data is less stable compared to those of UVES and ESPaDOnS, however our procedure is able to align the UES spectra to the same level of accuracy as the other instruments.
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