Frequency distribution of all ALMA transient brightenings as a function of energy shown with black curve. The gray band represents the error bars discussed in Sect. 4. For energies > 2.4 × 10²⁴ erg, the frequency distribution of events has been fitted with a power-law function with index of 1.67 (blue curve). The red curve corresponds to the frequency distribution vs. energy of only those ALMA events that have also been detected in AIA data (either 304 Å or 1600 Å). The green curve represents the fitting of that distribution with a power-law function with index of 1.65.