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Fig. 6.
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Polarization vectors of 4U 1538−52 from the results of the phase-resolved spectro-polarimetric analysis of the combined data set. Contours at 68.3%, 95.45%, and 99.73% c.l. calculated for two d.o.f. are shown in shades of blue for 2–3 keV and shades of red for 4–8 keV.
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