Comparison of EDIBLES (black) and UVES POP (red) spectra of HD 148937 (O6 f?p) for the interstellar Na lines (UV, top left; D, top right) and DIBs at λλ5480–5545 Å (lower left) and λλ6360–6379 Å (lower right). The telluric spectrum is shown in orange, and the average ISM DIB spectrum in green. The apparent feature at 6384 Å in the UVES POP data (bottom right panel) is related to the order merging, but the significant change in the He i 5876 line (top right panel) appears astrophysical in nature.