Fig. 8.
Evolution of the pulse period of Vela X-1 as observed by diverse instruments (gray squares, see Table A.2 for details), by CGRO/BATSE (blue circles) or by Fermi/GBM (red circles). BATSE and GBM period determinations are derived over two and three intervals of the orbit, respectively. Note the scale. The longest reported pulse period differs by ∼0.3% from the shortest known pulse.
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