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X-ray reflection spectroscopy is a powerful tool to study the strong gravity

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Soft proton flares are sudden increases in the background

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Fast and massive ionised gas is ubiquitously observed in the UV and

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The Advanced Telescope for High-energy Astrophysics (Athena) is being

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Copious amounts of intervening gas are frequently present within

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The endpoints of stellar evolution, white dwarfs, neutron stars

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The Athena science payload consists of

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The large collecting area, high spectral and spatial resolution