X-ray flare fluences (top panel) and durations (bottom panel) observed with XMM-Newton from 1999 to 2014. The red circles indicate the values computed in this work. The black circles indicate the values computed by Ponti et al. (2015). The red filled circles indicate the flares detected in our work that Ponti et al. (2015) missed. The gray lines connect the same flares. The x-axis reports the flare index corresponding to its numbering in Table A.1 and Fig. B.1. The asterisks denote the flares detected in the observations recently released.