Figure 3.

Transmission wide-angle X-ray scattering from the sample in Figure 1 with the beam incident at ω = 45°, so the three main labeled reflections are rotated in the laboratory frame according to formula¹¹ that also gives the q values in the caption to Figure 2. The first satellites of the (1,1) and (1,–1) are visible, as are the overlapping second satellites¹⁵ centered on the equator (q_r = 0), which follows a trajectory from the beam toward the (20) reflection. The weak ring closer to the beam than the WAXS reflections is from a Mylar window on the sample chamber and occurs because of imperfect subtraction of the background obtained from a substrate with no lipid. The intensity of the beam on the charge-coupled device was highly attenuated by an absorber downstream from the sample, and there are no lamellar reflections for large incidence angles ω.