Data from the The Rossi X-ray Timing Explorer Mission collected over between Feb '96 and Nov '99. 'The Rossi X-ray Timing Explorer (RXTE) is a satellite that observes the fast-moving, high-energy worlds of black holes, neutron stars, X-ray pulsars and bursts of X-rays that light up the sky and then disappear forever.' Source and more info- http://heasarc.gsfc.nasa.gov/docs/xte/xte_1st.html
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