Comparisons between the centroid of He I λ 6678 Å and the centroids of other lines detected in the spectrum of Schulte 12 (He I lines on top left, H I lines on top right, and metallic absorption and emission lines on bottom left and right, respectively). Filled symbols correspond to Hermes data, open symbols and crosses to Carmenes data; the diagonal yields the one-to-one correlation. For comparison, the case of a DIB is added to the last panel.