Top panel: synthetic solar spectra (purple) and telluric O2 transmittance (blue) computed with the PSG tool. Bottom panel: solar atlas from Delbouille et al. (1973) observed at the Jungfraujoch Scientific Station, Switzerland (black) and the synthetic atlas for the same conditions (orange) generated with the PSG tool. The vertical dotted line indicates the K I D2 line located at 7664.90 Å.
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