Profiles of magnetic fields generated by the Tayler-Spruit dynamo in the poloidal B_r and toroidal B_t components for the donor star at different evolutionary stages. The profiles represent the stages of inversion of the ¹H/⁴He ratio (X₁ stage, left panel), the start of mass transfer (E-stage, middle panel) and the current stage (X2, right panel). The Eulerian diffusion coefficient for mixing is represented in orange color, the Spruit-Tayler (ST) diffusion coefficient by the brown line, the poloidal magnetic field as a black line, the toroidal magnetic field in green, whereas the angular momentum is represented in blue and the angular velocity in red.