On the nature of the Cygnus X-2 like Z-track sources

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Table 1:

Spectral fitting results for Cygnus X-2: 90% confidence errors are shown.
$\;\;$ spectrum	$N_{\rm H}$	kT	$norm_{\rm BB}$	$R_{\rm BB}$	$E_{\rm CO}$	$norm_{\rm CPL}$	$\chi^2$ /d.o.f.
		(keV)		(km)	(keV)
Horizontal Branch
1	$1.5\pm 0.6$	$2.31\pm 0.20$	$1.96\pm 0.33$	$2.1\pm 0.4$	$7.29\pm 0.69$	$3.93\pm 0.41$	66.7/69
2	$2.0\pm 0.5$	$2.37\pm 0.16$	$1.74\pm 0.24$	$1.9\pm 0.3$	$7.00\pm 0.45$	$4.50\pm 0.34$	77.6/68
3	$2.2\pm 0.5$	$2.20\pm 0.14$	$1.67\pm 0.20$	$2.1\pm 0.3$	$6.90\pm 0.27$	$5.16\pm 0.33$	64.3/68
4	$2.3\pm 0.5$	$2.20\pm 0.15$	$1.76\pm 0.20$	$2.2\pm 0.3$	$6.70\pm 0.30$	$5.52\pm 0.39$	82.8/68
5	$2.6\pm 0.5$	$1.99\pm 0.16$	$1.51\pm 0.30$	$2.4\pm 0.5$	$6.68\pm 0.24$	$6.15\pm 0.45$	73.4/65
Hard Apex
6	$2.7\pm 0.5$	$1.92\pm 0.15$	$1.60\pm 0.35$	$2.7\pm 0.5$	$6.43\pm 0.22$	$6.71\pm 0.50$	52.6/55
Normal Branch
7	$2.6\pm 0.5$	$1.65\pm 0.12$	$1.43\pm 0.50$	$3.5\pm 0.7$	$5.95\pm 0.16$	$7.28\pm 0.60$	78.4/68
8	$2.4\pm 0.5$	$1.46\pm 0.08$	$1.56\pm 0.60$	$4.7\pm 1.0$	$5.68\pm 0.18$	$7.23\pm 0.72$	56.8/58
9	$1.9\pm 0.6$	$1.26\pm 0.05$	$2.54\pm 0.75$	$7.9\pm 1.3$	$5.59\pm 0.26$	$6.35\pm 0.85$	60.3/51
10	$1.6\pm 0.6$	$1.20\pm 0.04$	$2.93\pm 0.75$	$9.5\pm 1.3$	$5.45\pm 0.30$	$6.1\pm 0.9$	74.1/70
Soft Apex
11	$0.9\pm 0.6$	$1.19\pm 0.03$	$4.55\pm 0.70$	$12.0\pm 1.1$	$5.41\pm 0.30$	$4.97\pm 0.85$	53.6/63
Flaring Branch
12	$0.9\pm 0.9$	$1.22\pm 0.04$	$4.80\pm 1.30$	$11.9\pm 1.0$	$5.53\pm 0.60$	$5.05\pm 1.50$	47.9/47
13	$0.9\pm 0.9$	$1.31\pm 0.03$	$5.46\pm 0.6$	$10.9\pm 0.8$	$5.72\pm 0.26$	$4.87\pm 0.50$	58.5/56

Notes. Column densities are in units of 10²² atom cm^-2; the normalization of the blackbody is in units of $\rm {10^{37}}$ erg s^-1 for a distance of 10 kpc, the cut-off power law normalization is in units of photon cm^-2 s^-1 keV^-1 at 1 keV.

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