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Fig. 2.
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Colour-colour diagram of Sco X–1 from combined FPMA and FPMB data. The SC is the ratio of the count rate in the energy bands 6−10 keV and 3−6 keV, while the HC is the ratio of the count rate in the energy bands 10−20 keV and 6−10 keV. The bin time is 128 s.
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