TABLE 1.

Summary of x-ray criteria for phase coexistence

Criterion	See Fig.	Gel-fluid?*	Ld-Lo?*	Requires oriented samples?	Complications
1 (Double Ds)	4	Yes	Yes	No	Sufficient but not necessary
2a (Double ds obvious in I(q) plot)	1 A	Yes	No	No	1. Fluid WAXS peak often obscured in unoriented samples
					2. A single gel phase can have 2 d spacings†
2b (Double ds inferred from shape of q0(φ) plot)	3	No	Yes	Yes	Requires
3 (Double Sx-ray)	2	No	Yes	Yes	Requires modeling

^*The phrases “gel-fluid?” and “Ld-Lo?” ask if the criterion is applicable to that type of phase coexistence.

^†The Lβ′ phase has two wide angle d spacings due to its distorted hexagonal lattice. However, both Lβ′ peaks are narrower (40) than fluid-phase peaks.