Supplemental Video 4 from Bioapatite in shark centra studied by wide-angle and by small-angle X-ray scattering

block m (great hammerhead). The D-period arcs for this set of position were present but difficult to observe. Frame 868 shows one of the more prominent D-period peaks. Note that the overall intensity is not insignificant but is concentrated in the halo which is wider azimuthally than for other blocks.