When the coronal approximation breaks down …
	v The 2p-3s lines in some L-shell ions have the annoying habit of being populated by a variety of processes, not only CE, but also RE, and DR, and to a lesser extent also CI and RR (Doron & Behar 2002) v Resonant absorption could (under special circumstances) affect these ratios: e.g., NGC 4636 (Xu, Kahn, Peterson, et al. 2002)
						15