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Fig. A.1.

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Selection of short-timescale light curves of MAXI J1820+070 from the campaign presented in this work. The X-ray spectral hardness is colour-coded, as indicated by the colour bar (red is hard, blue is soft). The g′- and i′-band light curves are shown as stars and squares, respectively. Time is measured in minutes since the start of each light curve.

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