Nanoflare frequency distribution for each data set over the years 2011–2018 during solar cycle 24. The start date and time of the corresponding data set are given on the top. Events were extracted with the detection interval set to D = 2, a threshold factor of F = 5, and a combination interval of C = 5. A linear fit (blue) without the use of the weights derived from the counting errors (red) was used to extract the power-law index (α) and its fitting error (σ).