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Fig. 4


Deep PEPSI spectrum (dots with error bars) and its individual 20 exposures (lines) for a 1-Å wavelength region around the Cr I 6428.1-Å line. The twenty individual back-to-back spectra are offset in continuum by +0.01 for better visibility. The deep spectrum is unshifted and directly compared with the IAG (blue line) and NSO (red line) FTS atlases. We note that the equivalent width of the Cr line at 6428.1 Å is just 1.8 mÅ.

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