Cumulative distribution function of flare energies for X-ray members in NGC 1893 (solid line) and ONC (dotted line). The distributions are normalized to the total number of sources of each sample and to the total exposure time. In the range of energies above the cutoff value E_cut = 2    ×    10³⁵ erg (vertical segment), where both the flare energy distributions are complete, the distributions of the flares follow similar distributions.