Table 1.

Parameters corresponding to the least-squares fits shown in Fig. 2, comparing the SV fractions of this study to Castorph et al. (2010a). ${\rho }_i$ is the amplitude and $t_i$, $i\in \{in,out,tail\}$ is the width, for each of the Gaussians representing the headgroups and the tail region. $R_g^i$ and $N_c^i$, $i\in \{in,out\}$, denote the radii of gyration, and the copy numbers of the Gaussian chains, and ${\sigma }_c$ the corresponding electron density. All (excess) densities denote the density difference to the buffer solution. The thickness of the bilayer is $D=\sqrt{2\pi }(t_{\mathit{in}}+t_{\mathit{tail}}+t_{\mathit{out}})$, with $t_{\mathit{in}}=t_{\mathit{out}}$, since the bilayer is assumed to be symmetric. R denotes the vesicle radius defined as the center of the bilayer. ${\sigma }_R$ denotes the Gaussian width of the SV polydispersity, and a its amplitude. $R_{\mathrm{large}}$ and ${\sigma }_{R,\mathrm{large}}$ denote the corresponding parameters for the contamination fraction

Model fit parameter	SVs, this study	SVs, Castorph et al.	Unit
${\rho }_{\mathit{in}}$, ${\rho }_{\mathit{out}}$	46.8	46.8	e${}^{-}$ nm${}^{-3}$
${\rho }_{\mathit{tail}}$	$-28.8$	$-28.8$	e${}^{-}$ nm${}^{-3}$
$t_{\mathit{in}}$, $t_{\mathrm{out}}$	1.6	1.79	nm
$t_{\mathit{tail}}$	2.33	2	nm
$R_g^{\mathit{in}}$	2.51	2.86	nm
$R_g^{\mathit{out}}$	4.38	5.3	nm
$N_c^{\mathit{in}}/(4\pi {(R-D-R_g^{\mathit{in}})}^2)$	0.0179	0.0084	${\mathrm{nm}}^{-2}$
$N_c^{\mathit{out}}/(4\pi {(R+R_g^{\mathit{in}})}^2)$	0.00136	0.0009	${\mathrm{nm}}^{-2}$
${\rho }_{\mathrm{c}}$	52.1	52.1	e${}^{-}$ nm${}^{-3}$
R	16.95	16.95	nm
${\sigma }_R$	3.92	3.92	nm
$\mathrm{Amplitude}$	248.19	248.19	Arb. units
$R_{\mathrm{large}}$	277.84	328.58	nm
${\sigma }_{R,\mathrm{large}}$	40.8	82.5	nm
${\mathrm{Amplitude}}_{\mathrm{large}}$	0.43	1.22	Arb. unit
$\mathrm{Scale}$	1.0097	0.0838	–
$\mathrm{Constant}\mathrm{background}$	0.00109	0.00019	1/mm