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The time reversal symmetric polar phase of the spin-triplet superfluid $^3$Hehas two types of Dirac nodal lines. In addition to the Dirac loop in thespectrum of the fermionic Bogoliubov quasiparticles in the momentum space$(p_x,p_y,p_z)$, the spectrum of bosons (magnons) has Dirac loop in the 3Dspace of parameters -- the components of magnetic field $(H_x,H_y,H_z)$. Thebosonic Dirac system lives on the border between the type-I and type-II.

Polar phase of superfluid $^3$He: Dirac lines in the parameter and momentum spaces