Table 3. Parameters of the ELBA force field.

,	0.52 nm
,	0.46 nm
,	0.45 nm
	0.30 nm
,	6.0 kJ/mol
,	4.0 kJ/mol
,	3.5 kJ/mol
	1 kJ/mol
,	e
	e
	D
	D
	D
	1260 kJ/(mol nm)
	30 kJ/mol
	10 kJ/mol
,
,	90 amu
,	62 amu
,	42 amu
	40 amu
,	10 amu nm
	1 amu nm

Subscripts , , , , , and stand for the site types choline, amine, phosphate, glycerol, ester, tail and water, respectively. Lennard-Jones cross-terms are calculated by the standard Lorentz-Berthelot rules [23] except for increased terms representing hydrogen bonding; in particular, , , , , are set as reported in the table. Charges and dipoles are identified by and ; cross terms are obtained via standard electrostatic formulae [35]. The rigidity of the Hooke harmonic potential (equation 4) is identified by ; reference lengths are set to . The rigidity of the angle potential (equation 5) is identified by ; reference angles are reported for the relevant triplets of sites. The rigidity of the orientation-restraining potential (equation 10) is . Masses and principal moments of inertia are identified by and , respectively.