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Table A.1.

Overview of the best-fitting models to the XMM-Newton data.

Namea χ2/dof log(Z) Parameters
One-Component Models

DISKPBBb 475.22/431 −258.1 eV
p = 0.34 ± 0.01
COMPTTc 495.51/430 −266.4 kBT0 = 49 ± 1 eV
kBTe < 50 keV
τ < 1.2
NTHCOMPd 469.79/431 −251.6 kBT0 = 62 ± 2 eV
kBunconstrained
Γ = 6.09 ± 0.15
ZLOGPARe 453.48/431 −239.7 a = 2.74 ± 0.18
b = 2.73 ± 0.21
Ep = 0.2 keV (fixed)

Two-Component Models

ZBBODY+ 459.17/430 −246.1 kBT1 = 53 ± 2 eV
ZBBODYf eV
ZBBODY+ 455.47/428 −239.2 eV
COMPTT kBTe < 31 keV
τ < 0.02
TBABS 466.52/428 −250.0
THCOMP(ZBB)g kBTe < 1.2 keV
T0 = 53 ± 2 eV
cf > 0.95
COMPTT 454.46/427 −258.0 kBT0, 1 = 45 ± 2 eV
COMPTT keV
τ1< 0.3
kBT0, 2 = 97 ± 1
τ2 < 0.05

Notes. a) All models include a TBABS term to account for Galactic absorption. b) DISKPBB models a disk emission profile where the disk surface-temperature profile T ∝ rp and the disk has an inner edge with temperature Tin. c) COMPTT (Titarchuk 1994) represents a Comptonised emission component with parameters seed photon temperature T0, plasma electron temperature kBTe, and optical depth τ. d) NTHCOMP models a multi-colour blackbody Comptonised into a power law (Zdziarski et al. 1996; Życki et al. 1999), set by T0, kBTe, and power-law photon index Γ. e) ZLOGPAR is purely phenomenological and is set by A(E) = K(E(1 + z)/Ep)( − a − blog(E(1 + z)/Ep)). f) ZBBODY is the standard redshifted blackbody, set by kBT. g) THCOMP (Zdziarski et al. 2020) yields a modified blackbody, based on parameters τ, kBTe, kBT0, and covering factor cf.

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