Table 1.

Composition of samples and measured membrane parameters. d: lamellar repeat distance calculated from the Bragg peaks found in the reflectivity , $d_{MM}$: maximum-to-maximum electron density distance as determined from a Fourier reconstruction, d${}_{water}$: water layer spacing; calculated from $d-d_{MM}$ and $A_L$: area per lipid, calculated from the in-plane Bragg rod location. (* with an uncertainty of ±0.1 Å)

DMPC	DMPS	Chol	A${\mathsf{\beta }}_{22-40}$	A${\mathsf{\beta }}_{1-42}$	d *	$d_{\mathrm{MM}}$ *	$d_{\mathrm{water}}$ *	$A_L$
(mol %)	(mol %)	(mol %)	(mol %)	(mol %)	(Å)	(Å)	(Å)	(Å${}^2$)
Without peptide
92.0	8.0	0	-	-	50.3	35.2	15.1	46.0 ± 0.2
82.8	7.2	10	-	-	52.7	-	-	46.4 ± 0.4
64.4	5.6	30	-	-	54.3	39.7	14.6	46.7 ± 0. 1
59.8	5.2	35	-	-	54.3	-	-	47.3 ± 0.2
55.2	4.8	40	-	-	51.8	40.5	11.3	51.8 ± 0.4
46.0	4.0	50	-	-	51.4	-	-	53.6 ± 0.3
A${\mathsf{\beta }}_{22-40}$
90.6	7.9	0	1.5	-	52.0	37.8	14.2	46.5 ± 0.1
63.4	5.5	29.6	1.5	-	53.2	40.0	13.2	50.2 ± 0.3
54.4	4.7	39.4	1.5	-	54.8	41.4	13.4	47.6 ± 0.1
45.3	3.9	49.3	1.5	-	58.4	-	-	50.5 ± 0.3
A${\mathsf{\beta }}_{1-42}$
63.4	5.5	29.6	-	1.5	55.3	39.1	16.2	46.7 ± 0.2
54.4	4.7	39.4	-	1.5	54.6	40.4	14.2	47.6 ± 0.1
45.3	3.9	49.3	-	1.5	52.7	39.1	13.6	50.3 ± 0.3