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- galaxies: clusters: general4
- spectrum analysis4
- astrophysics3
- astrophysics - astrophysics of galaxies3
- [phys.astr.co]physics [physics]/astrophysics [astro-ph]/cosmology and extra-galactic astrophysics [astro-ph.co]2
- active galaxies2
- astronomical observations2
- bl lacertae objects2
- bl lacertae objects: general2