When a pixelated X-ray detector with a single crystalline sensitive layer is illuminated from a monochromatic point source, a pattern of dark lines appears which overlays all detected images. See this paper for an explanation.
Experimental images are shown below for an energy range from 7500 eV to 9200 eV in steps of 5 eV with a rate of 75 eV/s. Download the video file here
Close up on the range 9130 eV to 9145 eV in steps of 0.2 eV with a rate of 2 eV/s. Download the video file here
Close up on the range 4565 eV to 4568 eV in steps of 0.1 eV with a rate of 1 eV/s. Download the video file here