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Table 1.

GTC data used in our study.

Dataset # of spectra Duration (min.) Lightcurve properties
Day 1 37 52 Decay of more than 1 mag in 1 h
Day 2 76 102 Double-peaked flare: including its rise, peak and decay
Day 3 76 102 Slow rise in the continuum flux
Day 4 76 102 Slow decay: brighter than day 1
Day 5 41 54 Decay ending in a plateau
Day 6 86 117 Full flare: Brigther than day 2, with faster decay
Day 7 37 48 Flares: fastest (< 5 min) but also weakest
Day 8 37 48 Bright plateau

Notes. Along with the day of the outburst (starting from MJD 57189), we provide the number of spectra, the total duration of the observation, and a description of the lightcurve. Further details on each dataset can be found in Muñoz-Darias et al. (2016) and Mata Sánchez et al. (2018).

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