(a) Definition of matching region on the diffraction pattern used for slice matching. Only the region filled with pink stripes was used for calculation of CC. qin and qout show the inner and outer radius in pixels from the center of the pattern. (b) Radial average of diffraction intensity on the diffraction patterns for each of the three beam intensities tested. Blue, red and green arrows indicate the matching region with qin − qout = 20–30 pixels, 10–20 pixels and 5–10 pixels for strong, medium and weak beam intensities, respectively. (c) Photon detected pixel ratio within the region between qin and qout on the diffraction pattern.