Figure 4. An X-ray diffraction pattern from a Xenopus interphotoreceptor retinol-binding protein crystal recorded at the A-1 station of the Cornell High Energy Synchrotron Source. The detector was at a distance 250 mm; the wavelength, the oscillation angle and the exposure time were 0.978 Å, 1°, and 15 s, respectively. The right upper corner segment is shown in higher contrast to demonstrate the limiting resolution of diffraction of ~2.45 Å.