The NuSTAR view of ultra-compact X-ray binaries | Astronomy & Astrophysics (A&A)

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Table 3.

Weighted averages of the spectral parameters according to the spectral states.

	Soft	Inter	Hard^†
kT_e (keV)	3.060 ± 0.003	12.52 ± 0.19	20.24 $_{- 0.67}^{+ 0.82}$ $Mathematical equation: $ _{-0.67}^{+0.82} $$
Γ	1.969 ± 0.001	1.938 ± 0.002	1.851 ± 0.002
kT_BB (keV)	1.128 ± 0.001^a	1.225 ± 0.003	1.005 ± 0.002
kT_disc (keV)	0.604 ± 0.002	0.512 ± 0.001^b	0.511 ± 0.002^b

Notes.^( † ) 4U 1626–67 was not included to derive the weighted average. ^(a)kT_BB = kT_seed for soft-state observations. ^(b)kT_disc = kT_seed for intermediate- and hard-state observations.

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