Example of typical distributions of RM values for FRB 20211212A: (left) from the mNFW model of a single foreground galactic halo (see Section 3.3); (middle) from the mNFW model of the corresponding host-galaxy halo (see Section 3.4.1); and (right) from the local environment in the ISM of the host galaxy and/or FRB progenitor (see Section 3.4.2). The positive values of the histograms correspond to the RM values for the case when the line-of-sight component of the magnetic field is aligned with the direction of the FRB sight line (parallel), whereas the negative parts of the histograms, illustrate the case where the line-of-sight component of the magnetic field is directed away from the observer (anti-parallel). The dashed maroon lines show the KDE fit to the resulting RM distributions (see Section 4). Note the different range of RM values in the panels.