Fig. 1.
Light curve and HID of Aql X-1 during its 2016 outburst. Grey dots represent the X-ray data, while the larger dots (coloured according to the X-ray state; see legend), mark the interpolated position for each GTC epoch. Epochs #1, #13, and #14 are marked with numbers. Upper pannel: light curve from MAXI (2–20 keV). Bottom pannel: HID obtained by using Swift/BAT (15–50 keV; hard band) and MAXI (2–20 keV; soft band), starting on MJD 57598. We only considered count rates exceeding 0.0022 photons cm−2 s−1 (MAXI) and 0.01 counts cm−2 s−1 (Swift/BAT). The source displays the usual hysteresis loop in the anticlockwise direction.
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