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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. QPOs —quasi-periodic oscillations, x-ray pulses from compact objects ROSAT —Roentgen Satellite (German-U.S.-U.K. collaboration) RXTE —Rossi X-ray Timing Explorer SAO —Smithsonian Astrophysical Observatory SIM —Space Interferometry Mission STScI —Space Telescope Science Institute ULDB —ultralong-duration balloon VERITAS —Very Energetic Radiation Imaging Telescope Array System VLBI —very long baseline interferometry XMM-Newton —X-ray Multi-Mirror Observatory, a European collaboration x-ray space mission
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