Cumulative energy distribution of SGR J1935+2154 bursts and FRB 121102. The radio energy of SGR J1935+2154 and the X-ray (8–200 keV) energy of FRB 121102 are estimated based on the energy ratio in radio and X-ray band of the FRB-associated burst. Different colors represent different sources, SGR J1935+2154 (black) and FRB 121102 (red). Dotted, dashed, and solid lines are the best-fitted model curves, including the PL model, the broken PL model, and the differential PL model with a maximum energy.