Spatial distribution of spectral features. From left to right, we show the spatial distribution of line core intensity, maximum linear polarisation, and maximum circular polarisation signals for the Si I 10827 Å spectral line. The top row corresponds to the results from the LTE computation, while the bottom panels display the results of the NLTE case. The region enclosed by the white/black square corresponds to the FOV used for the inversion analysis in Section 4.