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Fig. 6


Intensity (top) and hardness ratio (middle) curves during the RXTE/PCA observations with transition dips (day 23.7: a), d), respectively; day 24.0: b), e), respectively; day 26.1: c), f), respectively), using PCU2 data at a time resolution of 16 s. The light curve is for the 2–60 keV band, whilst the hardness is defined as the ratio of the count rates in the 4.9–9.8 keV and 2.1–4.9 keV bands. The curves are folded on the absorption dipping activity ephemeris (see Sect. 3). Bottom: hardness versus intensity diagram (HID) for the same three observations as above (g), h), and i) for day 23.7, 24.0 and 26.1, respectively), using the same data.

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