Fig. 5.
Long-term evolution of the Hα equivalent width of 4U 0115+63 in relation to its X-ray activity. Each spike in the bottom panel corresponds to a giant outburst. Optical data prior to 2015 come from Reig et al. (2016). From 2015 onwards the data points represent new observations obtained with the 1.3 m telescope at the Skinakas observatory.
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