Figure 6: Example of a larger 3D ion Coulomb crystal.
From: Control of the conformations of ion Coulomb crystals in a Penning trap
Comparison between an experimental image (a) of a relatively large 3D crystal and a simulation (b). The radial extent of the simulated crystal depends upon the rotation frequency. Optimizing the match with the experimental image allows the rotation frequency to be estimated. The best match is found for 174±4 ions with 
=0.66±0.01. Scale bar, 50 μm.
