Table A.1.
Spectral fit parameters of J12270 using the first composite model presented in Sect. 2.1.
| Parameter | High mode | Low mode | Quiescence |
|---|---|---|---|
| NH (1020 cm−2) |
 |
Tied all | Tied all |
| Power law Γ |
 |
1.78 |
– |
| Disc T( * ) (eV) | <100 | <89 | – |
| Disc norm Nd ( * ) | >220 | >339 | – |
| NS atmos. T (eV) | 188 |
99 |
Tied low mode |
| NS atmos. radius (km) |
 |
Tied all | Tied all |
| NS power law ΓP | – | 1.0 ± 0.1 | Tied low mode |
Notes. The fit provides a 
= 1.1 for 2255 degrees of freedom with a a null hypothesis probability of 0.08% and an additional systematic error of 2%. For each parameters errors are 90% confidence level (Δχ2 = 2.71). NS emission radius is computed assuming a 1.4 kpc source distance, a 1.4 M⊙ NS mass and a 10 km NS radius. ( * )We estimated an upper limit for the disc components excluding them from the fit since the inefficient disc component is too weak for being constrained.
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