FIG. 4.

Structures from solution by analysis of the average angular correlations. (a) Intensity distribution from four molecules of random orientation and average distance of 150 Å from each other overlaid incoherently; $\left|\overrightarrow{q}\right|$ is 2π$\left|\overrightarrow{H}\right|$ with $\overrightarrow{H}$ the scattering vector; resolution at the edge: 2 Å. (b) Coherent diffraction from an ensemble of four molecules of random orientation and average distance of 150 Å. Young's fringes can be easily identified. Blue bar: I(q) and I(q, Δϕ) on same resolution ring; red bar I(q) and I(q′, Δϕ) on different resolution rings. (c) Difference electron density recovered from simulated δB_l(q,q′), courtesy of Kanupriya Pande. Position of the chromophore head as well as a Arg52 changed relative to the reference structure. Red: negative difference electron density, green: positive difference electron density.