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| extragalactic background light (1) |
| galactic nuclei (1) |
| galaxies: active-galaxies: individual: pmn j0948+0022 (1) |
| galaxies: nuclei (1) |
| galaxies: seyfert (1) |
| gamma-ray emission (1) |
| gamma-rays: general (1) |
| large-area telescope (1) |
| line seyfert 1 (1) |
| multiwavelength observations (1) |