Top: T_b differences and ratios between network and cell as a function of reference μ. The symbols have the same meaning as in Fig. 6. The red full lines show the predictions of the FAL93 models. Bottom: the thick dashed lines indicate the electron temperature as a function of reference τ from the inversion of the observations for the cell interior (blue) and for the network (red); the thin full lines show the FAL93 models A and F.