Erratum: Spin Hamiltonian characterization and refinement for ${\mathrm{Pr}}^{3+}$:${\mathrm{YAlO}}_3$ and ${\mathrm{Pr}}^{3+}$:${\mathrm{Y}}_2{\mathrm{SiO}}_5$ [Phys. Rev. B 85, 014429 (2012)]