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Table A.1.

Best-fit parameters from our simultaneous spectropolarimetric analysis.

MODEL = CONSTANT × TBABS × LOGPAR × POLCONST
Component Parameter Units Value (±1σ)

LOGPAR α 2.82 ±0.005
β 0.20 ±0.004
pivotE keV 5. (f)
Norm 2.96e-3 ±1.e-5

POLCONST ΠX (%) 14 ±1
ψX (°) 107 ±3

TBABS NH 1022cm−2 1.34e-2 (f)

CONSTANT XMM-Newton 1. (f)
IXPE DU 1 1.11 ± 0.005
IXPE DU 2 1.06 ± 0.005
IXPE DU 3 1.01 ± 0.005
χ2 / d.o.f.= 740/650

Notes. Errors are 1σ confidence and (f) denotes a fixed parameter.

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