Fig. 8.
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OGLE V-I colour index as a function of I for eRASSU J050810.4–660653 (top), RX J0501.6–7034 (middle), and eRASSt J044811.1–691318 (bottom). The I values are interpolated to the times of the V-band observations. Due to the fast brightness changes seen from RX J0501.6–7034 the interpolated I values are only used when an I measurement exists within five days of the V-band observation.
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