Wavelength correction illustrated as RV shifts to the wavelength in the middle of a spectral order (vertical axis) determined for each spectrum. Red and blue asterisks show AA or BB nodding pairs of consecutive exposures where no interruption in AO operation occurred and thus we expected no change in the across-the-slit position. The differences in these pairs provide an alternative estimate of the precision. The mean differences are 80 m/s for N1 and 36 m/s for N2, which are to be compared to the estimates based on telluric line centres giving 91 and 53 m/s, correspondingly. The large shift between the nights was measured by cross-correlating the two templates and converting it to an extra RV for each night to provide a sense of scale for the reader. In reality, most of this shift is translation (not RV) due to the reproducibility of the CRIRES⁺ wavelength settings.