Table 2.

Summary of fading lifetimes $N_{\mathrm{e}}$ and $\Delta B$ for purple membrane diffraction patterns.

Quantity	80K	13K	4K	$N_{\mathrm{e}}$(80K)$/N_{\mathrm{e}}$(13K)	$N_{\mathrm{e}}$(80K)$/N_{\mathrm{e}}$(4K)
$N_{\mathrm{e}}$ (9 Å)	16.2	22.6		1.4
	15.8		26.6		1.7
$N_{\mathrm{e}}$ (5 Å)	7.7	11.7		1.5
	8.7		15.6		1.8
$N_{\mathrm{e}}$ (4 Å)	6.9	10.5		1.5
	7.1		14.1		2.0
$\Delta B$ (Å ${}^2$/(e${}^{-}$/Å ${}^2$))	5–6	3–4	2–3	1.5	1.9