Relative difference of estimated energy from LST-1 and MAGIC (blue for MAGIC-I, orange for MAGIC-II) camera images of the same event. The energy difference is normalized to weighted average energy obtained from all the telescopes (see Sect. 2.4). A 90% “gammaness” efficiency cut, 0.2° angular cut between the nominal and reconstructed source position and 0.3–3 TeV estimated energy cut are used. Each point corresponds to average from one run (with the error of the mean reported as error bar). Dependence on the zenith angle of the observation is shown in the left panel and on the LST-1 run number (increasing with time) is shown in the right panel.