Stokes parameters Q and U for the pulsar alone, extracted from the phenomenological model fit to IXPE data, without phase shifts in the polarization angle. The color gradient corresponds to the pulse phase, as shown in the subplot for the pulse profile (observed by Chandra). The transparency gradient corresponds to different DC subtractions from the optical Stokes, ranging from 0% subtraction for the most transparent curve to 90% subtraction for the least transparent curve (correspondingly, β/α ranges from 0.46 to 0.56; see Section 3 for more details).