tokens: This research has made use of data obtained through the HEASARC Online Service, provided by the NASA/GSFC, in support of NASA High Energy Astrophysics Programs. MC acknowledges the many discussion with suggestions provided by Professor A R Rao, TIFR, Mumbai, India. This research has made use of the General High-energy Aperiodic Timing Software (GHATS) package developed by T. M. Belloni at INAF – Osservatorio Astronomico di Brera.
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