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" ... When you take a look at the details of a system configured like this, it doesn't just depend on the major mass source lensing it, but all of this intricate dark matter substructure arising from these miniature halos as well. By examining exactly how the light from each of the four images is bent relative to one another – something only newly possible with spectroscopic techniques of ionized oxygen and neon signatures – it's possible to extract information about the types of subhalos that dark matter can form. ... "