Typical input observed spectrum. Top: input HARPS β Dor 1D spectrum (black solid line) on the green wavelength range. The continuum interpolation is displayed in red. Broad deep lines that are excluded from the continuum interpolation are highlighted in grey, and wavelength ranges with strong tellurics arehighlighted in orange. Bottom: normalised spectrum. The red solid line is normalised to unity. On both plots, the insert is a zoom on a 100-Å slice of the spectrum (in blue).
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