a) Flare maximum emission measure versus maximum temperature (energy band 0.2–12 keV). Symbols as in Fig. 6. b) As a) but also showing, as black dots, essentially all data points from the 2XMM-Tycho light-curves, i.e. each time bin (1 bin = 400 or 1600 s) in each light-curve is represented on the plot, irrespective of the presence of a flare; the temperature range has been restricted for clarity in showing the bulk of the distribution.