Line profile development for Mg I 4571.10 Å line in the NOT sequence. Note, as with the development of [O I] 6300 Å intercombination line, the combined contributions of chromospheric and shock emission. The dates are the same as those in Fig. 10 with the exception of the last panel. This shows the emission peak at 4571 Å and the absorption at 5167 Å on JD 55 287. See text for discussion.
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