Figure 3
The intensity diffracted by a stack of purple membranes at the energy E1 = 2152 eV (5.761 Å) (open circles) and E2 = 2154 eV (5.755λ) (not shown) and its difference I(E1) − I(E2) (black circles) as a function of the scattering angle 2θ (°). Indices (h,k) are marked. The two-dimensional hexagonal plane group is p3 with a = 61 Å (Biou et al., 2005). |