**Table 1:** Mid-IR and ERE fluxes in NGC 7023 and the Red Rectangle.
	Mid-IR^*	ERE^**	$I_{\rm ERE}/I_{\rm mid-IR}$
PDR	(W m^-2 sr^-1)	(W m^-2 sr^-1)
NGC 7023-S	$4.11 \times 10^{-5}$	$1.44 \times 10^{-7}$	0.0035
NGC 7023-N	$1.40 \times 10^{-4}$	$2.30 \times 10^{-6}$	0.0164
Red-Rect	$9.04 \times 10^{-4}$	$7.10 \times 10^{-6}$	0.008

^* Integrated Spitzer-IRS (5-14 $\mu$ m) spectrum at the positions at which ERE was observed by Witt & Boroson (1990). ^** From Witt & Boroson (1990), integrated between 550 and 850 nm.

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