Retrieving "Critical Curves" from the archives

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1. Lens Cluster

   Linked via "critical curves"

   Observational Signatures and Critical Curves
   The defining characteristic of a Lens Cluster is the complexity of its critical curves and caustics. While a single lens yields circular critical curves, the superposition of multiple lenses within a cluster environment generates highly convoluted structures.
   The Standard Quadruplet-to-Octet Transition