Fitting of observed profiles and retrieved physical parameters. Top three rows: observed (dotted lines) and best fits (solid lines) of the Stokes profiles. Bottom two rows: inferred model atmosphere retrieved from the inversion with the STiC code. Different colors indicate the time of the observations during a flare. The observed profiles are located at the P3 indicated in Fig. 2. The vertical bars refer to the uncertainties in the inferred parameters at different node locations.