Extended Data Table 3 Zero-point offsets between overlapping radial-velocity datasets from different instruments

From: A candidate super-Earth planet orbiting near the snow line of Barnard’s star

  1. Manual offsets are calculated from common regions of pairs of datasets for window sizes selected to ensure sufficient statistics and consistency in the case of three-way overlap. The last column lists the difference between the zero points calculated manually and those resulting from the global optimization, demonstrating general good agreement (values compatible with zero), except for the UVES dataset. Also, two distinct time regions are identified in the data and can be compared. Set 1 includes data from HIRES, UVES, HARPSpre, APF and PFS. Set 2 contains data from CARMENES, HARPS-N and HARPSpost. The relative zero point between these two sets is poorly defined because of very limited overlap, but the consistency between the manual and optimized values is very good. All errors correspond to 1σ.
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