Fig. 4
Left: sample of normalized OPD spectra in the λ6145 spectral range. The nominal resolution is R = 20 000, and the spectra S/N, from top to bottom, are 340 (HD 146233), 120 (HD 19518) and 100 (HD 191487). Some of the Fe i and Fe ii lines used in this spectral range for deriving atmospheric parameters are marked by the vertical dashes. The spectra are arbitrarily displaced on the vertical axis. Right: sample of normalized OPD spectra in the λ6563 spectral range. The nominal resolution is R = 20 000, and the spectra S/N, from top to bottom, are 230 (HD 146233), 200 (HD 159222), and 130 (HD 191487). The spectra are arbitrarily displaced on the vertical axis.
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