Fig. 1.
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Light curve of the 2023 outburst of RX J0440.9+4431 as observed by the facilities indicated in the legend and described in the main text. The vertical dashed line marks the probable date of the transition to a supercritical regime (around MJD 59971, i.e., January 27, 2023), while the horizontal dashed line marks the approximate luminosity level at the transition.
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