Magnetic field inference from a Ca II 8542 Å observation using the pixel-wise WFA, the NF WFA, and two additional approaches introducing an explicit regularization term: using the information of a potential extrapolation of the magnetic field (third row) and using the orientation of the fibrils (fourth row). The first column shows the longitudinal magnetic field, the second column shows the transverse magnetic field and the third column shows the azimuth of the magnetic field.