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Table 1.
Classification of caustic radius and peak radius.
| Classified by | Caustic radius | Peak radius | Note |
|---|---|---|---|
| Direction | Rc, t | Rp, t | Averaged over all directions |
| Rc, mj | Rp, mj | Along T1 (major axis) | |
| Rc, mn | – | Along T3 (minor axis) | |
| Physical meaning and location | First caustic | – | First apocenter (Splashback Radius), > 0.8R200 |
| Second caustic | – | Second apocenter, ∼0.6R200 | |
| Third caustic | – | Third or more apocenter, ∼0.4R200 | |
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