Table 2: Best-fit continuum parameters when the RGS1, RGS2, pn, MOS1 and MOS2 4U 1850-087 spectra were fit simultaneously. dbb = disk-blackbody, pow = power-law, ctt = Comptonization model COMPTT in XSPEC. $\alpha$ is the power-law photon index, $kT_{\rm in}$ the inner disk temperature, $r{\rm _{in}}(\cos i)^{0.5}$ is the inner disk radius for a distance of 8 kpc, i is the disk inclination angle and $R{\rm _{bb}}$ is the blackbody radius. For the COMPTT model, $kT{\rm _0}$ is the temperature of the "seed'' photons, $kT{\rm _e}$ is the electron temperature (fixed at 70 keV) and ${\rm\tau _p}$ is the plasma optical depth.
Model $N{\rm _H}$ $\alpha$ $kT{\rm _{in}}$ $r{\rm _{in}} (\cos i)^{0.5}$ $kT{\rm _{bb}}$ $R{\rm _{bb}}$ $kT{\rm _0}$ ${\rm\tau _p}$ $\chi ^{2}$ /d.o.f.

(10²¹ cm^-2) (keV) (km) (keV) (km) (keV)

Observation 1

dbb+pow $\rm 5.7 ^{+0.3}_{-0.2}$ $\rm 2.03^{+0.06}_{-0.06}$ $\rm0.69^{+0.02}_{-0.02}$ $\rm 2.9^{+0.2}_{-0.2}$ ... ... ... ... 1.34/1092

bb+pow $\rm 6.1^{+0.2}_{-0.2}$ $\rm 2.18^{+0.04}_{-0.04}$ ... ... $\rm0.48^{+0.02}_{-0.02}$ $\rm 5.1 ^{+0.6}_{-0.6}$ ... ... 1.37/1092

dbb+ctt $\rm 4.1^{+0.1}_{-0.1}$ ... $\rm0.73 ^{+0.03}_{-0.02}$ $\rm 2.5 ^{+0.3}_{-0.2}$ ... ... $\rm0.23^{+0.01} _{-0.03}$ $\rm 1.2^{+0.1}_{-0.1}$ 1.30/1091

Observation 2

dbb+pow $\rm 5.7^{+0.2}_{-0.3}$ $\rm 2.16 ^{+0.06}_{-0.06}$ $\rm0.75^{+0.06} _{-0.04}$ $\rm 1.8 ^{+0.4}_{-0.4}$ ... ... ... ... 1.43/963

bb+pow $\rm 5.9^{+0.2}_{-0.2}$ $\rm 2.24 ^{+0.04}_{-0.04}$ ... ... $\rm0.55^{+0.07}_{-0.04}$ $\rm 2.7 ^{+1.0}_{-0.7}$ ... ... 1.44/963

dbb+ctt $\rm 3.6^{+0.2}_{-0.5}$ ... $\rm0.84^{+0.10} _{-0.05}$ $\rm 1.5 ^{+0.4}_{-0.4}$ ... ... $\rm0.22^{+0.03} _{-0.02}$ $\rm 1.0^{+0.1} _{-0.1}$ 1.38/962

**Table 2:** Best-fit continuum parameters when the RGS1, RGS2, pn, MOS1 and MOS2 4U 1850-087 spectra were fit simultaneously. *dbb* = disk-blackbody, *pow* = power-law, *ctt* = Comptonization model COMPTT in XSPEC. $\alpha$ is the power-law photon index, $kT_{\rm in}$ the inner disk temperature, $r{\rm _{in}}(\cos i)^{0.5}$ is the inner disk radius for a distance of 8 kpc, i is the disk inclination angle and $R{\rm _{bb}}$ is the blackbody radius. For the COMPTT model, $kT{\rm _0}$ is the temperature of the "seed'' photons, $kT{\rm _e}$ is the electron temperature (fixed at 70 keV) and ${\rm\tau _p}$ is the plasma optical depth.
Model	$N{\rm _H}$	$\alpha$	$kT{\rm _{in}}$	$r{\rm _{in}} (\cos i)^{0.5}$	$kT{\rm _{bb}}$	$R{\rm _{bb}}$	$kT{\rm _0}$	${\rm\tau _p}$	$\chi ^{2}$ /d.o.f.
	(10²¹ cm^-2)		(keV)	(km)	(keV)	(km)	(keV)
Observation 1
dbb+pow	$\rm 5.7 ^{+0.3}_{-0.2}$	$\rm 2.03^{+0.06}_{-0.06}$	$\rm0.69^{+0.02}_{-0.02}$	$\rm 2.9^{+0.2}_{-0.2}$	...	...	...	...	1.34/1092
bb+pow	$\rm 6.1^{+0.2}_{-0.2}$	$\rm 2.18^{+0.04}_{-0.04}$	...	...	$\rm0.48^{+0.02}_{-0.02}$	$\rm 5.1 ^{+0.6}_{-0.6}$	...	...	1.37/1092
dbb+ctt	$\rm 4.1^{+0.1}_{-0.1}$	...	$\rm0.73 ^{+0.03}_{-0.02}$	$\rm 2.5 ^{+0.3}_{-0.2}$	...	...	$\rm0.23^{+0.01} _{-0.03}$	$\rm 1.2^{+0.1}_{-0.1}$	1.30/1091
Observation 2
dbb+pow	$\rm 5.7^{+0.2}_{-0.3}$	$\rm 2.16 ^{+0.06}_{-0.06}$	$\rm0.75^{+0.06} _{-0.04}$	$\rm 1.8 ^{+0.4}_{-0.4}$	...	...	...	...	1.43/963
bb+pow	$\rm 5.9^{+0.2}_{-0.2}$	$\rm 2.24 ^{+0.04}_{-0.04}$	...	...	$\rm0.55^{+0.07}_{-0.04}$	$\rm 2.7 ^{+1.0}_{-0.7}$	...	...	1.44/963
dbb+ctt	$\rm 3.6^{+0.2}_{-0.5}$	...	$\rm0.84^{+0.10} _{-0.05}$	$\rm 1.5 ^{+0.4}_{-0.4}$	...	...	$\rm0.22^{+0.03} _{-0.02}$	$\rm 1.0^{+0.1} _{-0.1}$	1.38/962

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations
	3 Results
	4 Discussion
	References