Cumulative distribution of R1 burst energies detected with VLA (3000 MHz), GBT (2000 MHz), Arecibo (1400 MHz), and Apertif (1400 MHz). The data used are described in Table 2. Poissonian errors on the rates are shown for illustrative purposes. The typical power-law value for the early Arecibo, GBT, and VLA data is −0.7, while the later Arecibo data suggest a slope of −1.8(3) above a completeness threshold of 2 × 10³⁷ erg. The Apertif data suggest a slope of −1.7(6) above the completeness threshold of 1.5 × 10³⁹ erg, which is indicated by the vertical dashed line.