Top: Continuum intensity (left) and the Stokes V in the line wing (right) in the ROI at the time t = 600 s with respect to the start of the observations. Bottom four panels: Stokes I, Q, U, V at the five selected locations. Stokes Q, U, V have been offset vertically for clarity. Dashed and full lines denote observed and FIRTEZ-fitted spectra. All Stokes components are normalized to the continuum at the quiet Sun at the disk center.