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| absorption (1) |
| bl lacertae objects: individual (pks 1424+240)-cosmic background radiation (1) |
| energy cosmic-ray (1) |
| extragalactic background light (1) |
| gamma rays: galaxies (1) |
| large-area telescope (1) |
| radiation (1) |
| redshift (1) |
| space-telescope mission (1) |
| spectra (1) |