  Scrutiny of an established monoclinic magnetic space group for NdFeO3 reveals
hitherto unknown properties of the orthoferrite. Future experiments using
neutron and x-ray diffraction techniques can verify them. Neodymium ions
possess Dirac multipoles, both time-odd (magnetic) and parity-odd (polar), that
come with unique diffraction conditions. Non-magnetic polar Nd multipoles are
permitted even though the monoclinic space group is centrosymmetric. Dirac
multipoles are forbidden by symmetry at sites occupied by ferric ions.
Available diffraction patterns have not been analysed for Dirac multipoles. Nor
all permitted components of the axial dipoles and quadrupoles. In the case of
neutron diffraction, magnetic quadrupoles are correlations between anapole and
orbital degrees of freedom. We give conditions for the observation of
Templeton-Templeton scattering of x-rays, created by angular anisotropy in the
electronic charge distribution. Axial multipoles are the sole providers of
dichroic signals.
