Fig. 1.
Top panel: O5+ fraction of total oxygen ions versus solar atmospheric temperatures (T). The horizontal dotted line with a value of 0.050 denotes the abundance criterion for unusual abundance in the present paper. Bottom panel: Fe6+ fraction of the total oxygen ions versus the solar atmospheric temperatures. The horizontal dotted line with a value of 0.100 denotes the abundance criterion for unusual abundance, where K indicates the units of Kelvin. The figure is reproduced based on the database and IDL programs provided by the CHIANTI web site.
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