Modelling of the June 2015 flaring state of 3C 279. The black, blue, and purple data points display the MWL data during the low state, flare peak, and in the pre-peak state of ‘Night 1’ (≈8.9 h earlier), respectively (H. E. S. S. Collaboration 2019). The data points at the highest energies are uncorrected for the extragalactic background light (EBL) absorption. The error bars for the optical and X-ray data points are relatively small and are not visible. The grey curve shows the low-state model from Fig. 1, the cyan curve indicates the time-dependent flare model at the moment t₁ = 3.6 R_b/c, fitting the pre-peak state data, and the green curve illustrates the same model at the moment t₂ = 12.8 R_b/c, fitting the flare peak data. The model SEDs were absorbed on the EBL using the model by Domínguez et al. (2011). The model curves are displayed in the dashed style to highlight the use of the continuous-loss approximation in the model calculation.