1s-2p (Ka) Inner-Shell Absorption
		v L-shell ions have vacancies in their 2p sub-shell and absorb by means of 1s-2p resonance lines v Have been observed in many sources and for many elements v Span wide range in ionization => very useful for probing the ionization state(s) of the plasma v Autoionizing upper levels affect line shapes and ionization balance
				Behar & Netzer 2002
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