Difference between the synchrotron solution derived here and the solution derived in other works. Top: Difference between the BEYONDPLANCK synchrotron solution (Svalheim et al. 2023b) and the synchrotron component derived here. Bottom: Difference between Planck DR4 and the synchrotron component derived here. We note a difference along the Galactic plane, which is likely due to the strong degeneracy between dust and synchrotron emissions in this region. The left and right columns correspond to Stokes Q and U, smoothed with a 3° FWHM Gaussian beam.