Radial diffraction of osmium. (a) The x-ray diffraction patterns taken at ψ = 0°, 54.7°, and 90° under 36.5 GPa. (b) Dependence of d-spacing on 1 − 3 cos² ψ for diffraction line (110). The solid lines are least-squares fits to the data. The pressure is determined from the lattice parameter of gold observed at ψ = 54.7°.^[91]