Cumulative log frequency vs. log energy for the total set of observations. Error bars are given by the Poisson noise . The dashed blue line represents the linear fit for Ds Tuc. The yellow lines show the fits for AU Mic at energies higher than 2 × 10³³ erg (dashed line) and for energies higher than 10³³ erg (dashed-dotted line). The vertical lines are located at the break energy used for each fit.