Fig. 3
Example of K I doublet dual interstellar-telluric profile-fitting: star HD 24534 (X Per). The spectra are shown around the 7699 (resp. 7665) Å line on the left (resp. on the right). Top graphs: the fitted interstellar model before convolution by the instrumental profile (blue line), superimposed on the raw data. Bottom graphs: the adjusted interstellar-telluric model (blue line) superimposed on the normalized data. For this target, the interstellar K I lines are Doppler shifted out of the strong telluric oxygen lines.
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