An x-ray diffraction pattern. A protein crystal diffracts x-rays to produce a pattern of spots, or reflections, on the detector surface. The white silhouette in the center of the image is from a beam stop which protects the detector from the intense, undiffracted x-rays.

[S. Lansky, O. Alalouf, V. Solomon, A. Alhassid, L. Govada, N. E. Chayan, H. Belrhali, Y. Shoham, and G. Shoham. Acta Cryst. F69:430–434, 2013, Fig. 2.]