Comparison between the first and second IXPE observations. The polarization contours are (68, 90, and 99% c.ls.; see Eq. (32) of Muleri 2022) for the PD Π and the PA Ψ with respect to the north direction. First left panel: Comparison between first (in black) and second (in red) observation considering IXPE full energy band. Second to fourth panels: Comparison between first and second observation considering the division in three energy bins. Colors refer to the 2.0–3.5 keV (black, the first observation; yellow, the second observation); 3.5–5.0 keV (black, the first observation; green, the second observation); and 5.0–8.0 keV (black, the first observation; blue, the second observation) energy ranges, respectively.