Fig. 7
Distribution of the excitation potentials for 2532 lines of S0 (solid line), 1146 lines of S1 (dashed line), and 1386 lines of S2 (dotted line). Line identifications were made using the spectrum of Wallace et al. (2007) and the solar spectrum available in the BASS2000 archive2, and the excitation potentials were retrieved from the VALD archive (Piskunov et al. 1995; Ryabchikova et al. 1999, 2015; Kupka et al. 1999, 2000).
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