Magnetic field maps of β Cas and corresponding Stokes V profile fits obtained with ZDI for P_rot = 0.868 d. The plots on the left side show the radial, meridional, and azimuthal magnetic field components in the flattened polar projection. The thick circle corresponds to the stellar equator. The numbers next to surface plots correspond to rotational phases while the short bars illustrate rotational phase coverage. The colour bars indicate the field strength in Gauss. The right panel shows the observed (histogram) and model (solid red curves) profiles, shifted vertically with an equidistant step. The rotational phases (calculated relative to HJD₀ = 2457358.31370) are indicated to the right of each line profile.