Table 4: Spectral fits of the EPIC spectra of the quasars. The errors for the 90% confidence level are provided if $\chi ^2_{\rm reduced} < 2.0$ . Fits labeled with $\ddagger$ have $\chi ^2_{\rm reduced} > 2.0$ and consequently no errors were determined. Fits labeled with $\dagger$ were performed over the 2-10 keV energy range for MOS and the 2-12 keV energy range of pn, respectively. Explanation of labels: (1) explanation of the used models: pl: power-law (XSPEC: pow), nab: neutral absorber at the redshift of the source (XSPEC: zphabs), pab: partial covering with neutral absorber at the redshift of the source (XSPEC: zpcfabs), iab: ionized absorption at the redshift of the source (XSPEC: absori), ga: Gaussian line at the redshift of the source (XSPEC: zgauss), la: relativistic disk line after Laor (XSPEC: laor, Laor et al. 1997); Parameters: (a) equivalent column density; (b) covering fraction; (c) ionization level of absorbing material $\xi =L/nr^{2}$ , as defined in XSPEC; (d) photon flux at $1 \rm ~keV$ ; (e) degrees of freedom.
Fit model⁽¹⁾ Absorber Continuum Statistic

neutral warm power-law

$N_{\rm H}^{(a)}$ cf^(b) $N_{\rm H}^{(a)}$ $\xi^{(c)}$ $\Gamma$ N^(d) $\chi^2$ d^(e)

$[10^{22} ~\rm cm^{-2}]$ $[10^{22} ~\rm cm^{-2}]$ $[\rm erg ~ cm ~s^{-1}]$ $[ \rm keV^{-1}~cm^{-2}~s^{-1}]$

PG 1001+054

1 nab * pl $0.00^{\ddagger}$ $3.77^{\ddagger}$ $1.02^{\ddagger}\times 10^{-5}$ 156.7 9

2 pab * pl $7.86^{\ddagger}$ $0.95^{\ddagger}$ $3.20^{\ddagger}$ $2.44^{\ddagger}\times 10^{-4}$ 71.1 8

3 iab * pl $\rm 19.2_{-7.3}^{+11.9}$ $\rm 542^{+97}_{-147}$ $\rm 1.97 _{-0.14}^{+0.17 }$ $6.62^{+1.01}_{-0.71}\times 10^{-5}$ 15.6 8

PG 2112+059

4 nab * pl $0.00^{\ddagger}$ $1.54^{\ddagger}$ $7.40^{\ddagger}\times10^{-5}$ 92.0 41

5 pab * pl $\rm 4.55_{-1.17}^{+1.55}$ $\rm0.69_{-0.12}^{+0.08}$ $\rm 2.17_{-0.20}^{+0.09}$ $2.02^{+0.62}_{-0.53}\times10^{-4}$ 65.1 40

6 iab * pl $\rm 3.53_{-0.96}^{+1.33}$ $\rm 270^{+125}_{-72}$ $\rm 1.92_{-0.09}^{+0.09}$ $1.35^{+0.14}_{-0.13}\times10^{-4}$ 38.7 40

PG 1535+547

7 nab * pl $6.94^{\ddagger}$ $1.67^{\ddagger}$ $5.18^{\ddagger}\times10^{-4}$ 807.3 108

8 pab * pl $8.16^{\ddagger}$ $0.95^{\ddagger}$ $1.53^{\ddagger}$ $4.17^{\ddagger}\times10^{-4}$ 357.5 107

9 iab * pl $12.71^{\ddagger}$ $533^{\ddagger}$ $1.03^{\ddagger}$ $1.57^{\ddagger}\times10^{-4}$ 338.2 107

10 pab * iab * pl $\rm 10.3_{-0.8}^{+0.8}$ $\rm0.97_{-0.02}^{+0.01}$ $\rm 2.41_{-0.57}^{+0.86}$ $\rm 136_{-50}^{+81}$ $\rm 2.13_{-0.05}^{+0.05}$ $1.37_{-0.13}^{+0.14} \times10^{-3}$ 132.8 105

11 iab * (pl+la) $\rm 12.2_{-0.7}^{+0.5}$ $\rm 528_{-24}^{+84}$ $\rm 1.08_{-0.04}^{+0.01}$ $1.29_{-0.03}^{+0.06}\times10^{-4}$ 157.8 103

12
pab*iab*(pl+ga) $\rm 9.72_{-0.50}^{+0.60}$ $\rm0.97_{-0.01}^{+0.01}$ $\rm 2.52_{-0.25}^{+0.27}$ $\rm 145_{-19}^{+23}$ $\rm 2.13_{-0.05}^{+0.04}$ $1.28_{-0.04}^{+0.04} \times10^{-3}$ 115.8 102

13 $^{\dagger}$ pab*iab*(pl+ga) $\rm 13.2_{-1.3}^{+1.0}$ $\rm0.92_{-0.01}^{+0.01}$ $\rm 9.78_{-1.38}^{+1.09}$ $\rm 2126_{-698}^{+1379}$ $\rm 2.65_{-0.18}^{+0.16}$ $3.87_{-0.19}^{+0.13} \times10^{-3}$ 87.5 81

14 pab*iab*(pl+la) $\rm 8.90_{-0.56}^{+0.57}$ $\rm0.96_{-0.01}^{+0.01}$ $\rm 2.91_{-0.57}^{+0.81}$ $\rm 147_{-48}^{+70}$ $\rm 2.05_{-0.05}^{+0.04}$ $1.03_{-0.10}^{+0.09} \times 10^{-3}$ 104.1 101

15 $^{\dagger}$ pab*iab*(pl+la) $\rm 10.6_{-1.3}^{+1.8}$ $\rm0.93_{-0.03}^{+0.02}$ $\rm 6.60_{-2.90}^{+3.71}$ $\rm 620_{-490}^{+1087}$ $\rm 2.32_{-0.19}^{+0.20}$ $1.89_{-0.30}^{+0.22} \times 10^{-3}$ 83.4 80

**Table 4:** Spectral fits of the EPIC spectra of the quasars. The errors for the 90% confidence level are provided if $\chi ^2_{\rm reduced} < 2.0$ . Fits labeled with $\ddagger$ have $\chi ^2_{\rm reduced} > 2.0$ and consequently no errors were determined. Fits labeled with $\dagger$ were performed over the 2-10 keV energy range for MOS and the 2-12 keV energy range of pn, respectively. Explanation of labels: (1) explanation of the used models: pl: power-law (XSPEC: pow), *nab*: neutral absorber at the redshift of the source (XSPEC: zphabs), *pab*: partial covering with neutral absorber at the redshift of the source (XSPEC: zpcfabs), *iab*: ionized absorption at the redshift of the source (XSPEC: absori), ga: Gaussian line at the redshift of the source (XSPEC: zgauss), la: relativistic disk line after Laor (XSPEC: laor, Laor et al. 1997); Parameters: (a) equivalent column density; (b) covering fraction; (c) ionization level of absorbing material $\xi =L/nr^{2}$ , as defined in *XSPEC*; (d) photon flux at $1 \rm ~keV$ ; (e) degrees of freedom.
Fit	model⁽¹⁾	Absorber	Continuum	Statistic
		neutral	warm	power-law
		$N_{\rm H}^{(a)}$	cf^(b)	$N_{\rm H}^{(a)}$	$\xi^{(c)}$	$\Gamma$	N^(d)	$\chi^2$	d^(e)
		$[10^{22} ~\rm cm^{-2}]$		$[10^{22} ~\rm cm^{-2}]$	$[\rm erg ~ cm ~s^{-1}]$		$[ \rm keV^{-1}~cm^{-2}~s^{-1}]$
PG 1001+054
1	nab * pl	$0.00^{\ddagger}$				$3.77^{\ddagger}$	$1.02^{\ddagger}\times 10^{-5}$	156.7	9
2	pab * pl	$7.86^{\ddagger}$	$0.95^{\ddagger}$			$3.20^{\ddagger}$	$2.44^{\ddagger}\times 10^{-4}$	71.1	8
3	iab * pl			$\rm 19.2_{-7.3}^{+11.9}$	$\rm 542^{+97}_{-147}$	$\rm 1.97 _{-0.14}^{+0.17 }$	$6.62^{+1.01}_{-0.71}\times 10^{-5}$	15.6	8
PG 2112+059
4	nab * pl	$0.00^{\ddagger}$				$1.54^{\ddagger}$	$7.40^{\ddagger}\times10^{-5}$	92.0	41
5	pab * pl	$\rm 4.55_{-1.17}^{+1.55}$	$\rm0.69_{-0.12}^{+0.08}$			$\rm 2.17_{-0.20}^{+0.09}$	$2.02^{+0.62}_{-0.53}\times10^{-4}$	65.1	40
6	iab * pl			$\rm 3.53_{-0.96}^{+1.33}$	$\rm 270^{+125}_{-72}$	$\rm 1.92_{-0.09}^{+0.09}$	$1.35^{+0.14}_{-0.13}\times10^{-4}$	38.7	40
PG 1535+547
7	nab * pl	$6.94^{\ddagger}$				$1.67^{\ddagger}$	$5.18^{\ddagger}\times10^{-4}$	807.3	108
8	pab * pl	$8.16^{\ddagger}$	$0.95^{\ddagger}$			$1.53^{\ddagger}$	$4.17^{\ddagger}\times10^{-4}$	357.5	107
9	iab * pl			$12.71^{\ddagger}$	$533^{\ddagger}$	$1.03^{\ddagger}$	$1.57^{\ddagger}\times10^{-4}$	338.2	107
10	pab * iab * pl	$\rm 10.3_{-0.8}^{+0.8}$	$\rm0.97_{-0.02}^{+0.01}$	$\rm 2.41_{-0.57}^{+0.86}$	$\rm 136_{-50}^{+81}$	$\rm 2.13_{-0.05}^{+0.05}$	$1.37_{-0.13}^{+0.14} \times10^{-3}$	132.8	105
11	iab * (pl+la)			$\rm 12.2_{-0.7}^{+0.5}$	$\rm 528_{-24}^{+84}$	$\rm 1.08_{-0.04}^{+0.01}$	$1.29_{-0.03}^{+0.06}\times10^{-4}$	157.8	103
12	pabiab(pl+ga)	$\rm 9.72_{-0.50}^{+0.60}$	$\rm0.97_{-0.01}^{+0.01}$	$\rm 2.52_{-0.25}^{+0.27}$	$\rm 145_{-19}^{+23}$	$\rm 2.13_{-0.05}^{+0.04}$	$1.28_{-0.04}^{+0.04} \times10^{-3}$	115.8	102
13 $^{\dagger}$	pabiab(pl+ga)	$\rm 13.2_{-1.3}^{+1.0}$	$\rm0.92_{-0.01}^{+0.01}$	$\rm 9.78_{-1.38}^{+1.09}$	$\rm 2126_{-698}^{+1379}$	$\rm 2.65_{-0.18}^{+0.16}$	$3.87_{-0.19}^{+0.13} \times10^{-3}$	87.5	81
14	pabiab(pl+la)	$\rm 8.90_{-0.56}^{+0.57}$	$\rm0.96_{-0.01}^{+0.01}$	$\rm 2.91_{-0.57}^{+0.81}$	$\rm 147_{-48}^{+70}$	$\rm 2.05_{-0.05}^{+0.04}$	$1.03_{-0.10}^{+0.09} \times 10^{-3}$	104.1	101
15 $^{\dagger}$	pabiab(pl+la)	$\rm 10.6_{-1.3}^{+1.8}$	$\rm0.93_{-0.03}^{+0.02}$	$\rm 6.60_{-2.90}^{+3.71}$	$\rm 620_{-490}^{+1087}$	$\rm 2.32_{-0.19}^{+0.20}$	$1.89_{-0.30}^{+0.22} \times 10^{-3}$	83.4	80

Source LaTeX | All tables | In the text

	1 Introduction
	2 Optical and previous X-ray studies
	3 Observations and data reduction
	4 X-ray spectral analysis
	5 Spectral energy distribution
	6 Discussion
	7 Conclusions
	References