Table A.1.

Simultaneous fits of the two XMM-Newton and NuSTAR spectra with a relativistic reflection model with a coronal geometry for the accretion disc emissivity (RELXILL). The column density along the line-of-sight has been fixed at the Galactic value (1.27×10²⁰ cm⁻²), and the accretion disc inclination angle at 9.9 degrees. (a) The breaking radius R_br of the emissivity shape is expressed in ISCO units. ‘(f)’ means that the cutoff value was fixed at that found from the fit above 3 keV (see Table 2).

Parameters	0.3−10 keV	Full range
a	0.981	≥0.996
AFe	≤0.53	3.4
2019 Nov
q1	7.7	8.2
q2	2.0±0.2	3.4±0.1
Rbr (Risco)(a)	3.8	2.9±0.1
Γ	2.28±0.01	1.99
Ecut (keV)	113 (f)	≥941
log ξ (erg cm s−1)	≤0.04	3.0±0.1
ℛ	6.8	4.9
normrelxill	1.1±0.1×10−4	9.0±0.1×10−5
2020 April
q1	7.7	8.1
q2	2.2±0.2	3.4±0.1
Rbr (Risco)(a)	3.4	2.8
Γ	2.16	1.90±0.01
Ecut (keV)	126 (f)	≥976
log ξ (erg cm s−1)	≤0.09	3.0±0.1
ℛ	4.9	2.9±0.1
normrelxill	8.8±0.1×10−5	10.1±0.1×10−5
χ2/d.o.f.	1181.9/1099	1954.8/1617
	1.08	1.21