Table 1: Fit results and comparison between sets of data. XMM- Newton vs. Chandra observations of APM 08279+5255.
Parameter H a C b (pn+MOS)c pnd Cne
Fit 1: Pl and Neutral Absorption at Source  

$\Gamma$		 $\rm 2.04_{-0.03} ^{+0.03}$ $\rm 1.72_{-0.06} ^{+0.03}$ $\rm 1.99_{-0.02} ^{+0.02}$ $\rm 2.05_{-0.03} ^{+0.03}$ $\rm 1.79_{-0.03} ^{+0.03}$

Normf		 $\rm 1.30_{-0.05} ^{+0.05}$   $\rm 1.23_{-0.02} ^{+0.02}$ $\rm 1.25_{-0.02} ^{+0.02}$ $\rm 1.02_{-0.02} ^{+0.02}$

$N_{\rm H}$ ( $\times 10^{22}$ ${\rm cm}^{-2}$)		 $\rm 6.92_{-0.32} ^{+0.32}$ 6.0 -0.8 +0.8 $\rm 5.95_{-0.21} ^{+0.21}$ $\rm 6.28_{-0.25} ^{+0.26}$ $\rm 7.18_{-0.38} ^{+0.41}$

$\chi ^2$/(d.o.f.)		 481.8/(365) 182.1/(109) 564.5/(478) 330/(290) 229.7/(184)

$P_{{\rm global}}[{\rm Fit~1}]$		 $2 \times 10^{-5}$ $1.5 \times 10^{-5}$ $3 \times 10^{-3}$ 0.05 0.01
$\chi^2(1$- $2~{\rm keV})$/(d.o.f.) ... ... 134.7/(59) 72.4/(35) 85.7/(52)

$P_{(1-2~{\rm keV})}[{\rm Fit~1}]$		 ... ... $2 \times 10^{-9}$ $6 \times 10^{-5}$ $2 \times 10^{-3}$

Fit 2: Pl and Neutral Absorption at Source, and One Edge		  

$\Gamma$		 $\rm 2.01_{-0.03} ^{+0.03}$   $\rm 1.96_{-0.02} ^{+0.02}$ $\rm 2.02_{-0.03} ^{+0.03}$ $\rm 1.77_{-0.02} ^{+0.02}$

Normf		 $\rm 1.37_{-0.06} ^{+0.06}$   $\rm 1.28_{-0.02} ^{+0.02}$ $\rm 1.31_{-0.02} ^{+0.02}$ $\rm 1.09_{-0.01} ^{+0.01}$

$N_{\rm H}$ ( $\times 10^{22}$ ${\rm cm}^{-2}$)		 $\rm 7.34_{-0.34} ^{+0.34}$   $\rm 6.20_{-0.21} ^{+0.22}$ $\rm 6.54_{-0.26} ^{+0.27}$ $\rm 7.50_{-0.24} ^{+0.25}$

$E_{\rm edge}$ (keV)		 $\rm 7.68_{-0.10} ^{+0.10}$ $\rm 7.68_{-0.25} ^{+0.21} $ $\rm 7.70_{-0.17} ^{+0.16}$ $\rm 7.53_{-0.19} ^{+0.21}$ $\rm 7.70_{-0.13} ^{+0.11}$

$\tau$		 $\rm0.46_{-0.05} ^{+0.05}$ $\rm0.37_{-0.13} ^{+0.14} $ $\rm0.30_{-0.06} ^{+0.06}$ $\rm0.33_{-0.07} ^{+0.08}$ $\rm0.38_{-0.05} ^{+0.05}$

$\chi ^2$/(d.o.f.)		 394.6/(362) 146/(107) 506/(476) 292/(288) 190.1/(182)
$P_{{\rm global}}[{\rm Fit~2}]$ 0.12 $6 \times 10^{-3}$ 0.17 0.44 0.35
$\chi^2(1$- $2~{\rm keV})$/(d.o.f.) ... ... 74.5/(59) 35.4/(35) 53.7/(52)
$P_{(1-2~{\rm keV})}[{\rm Fit~2}]$ ... ... 0.09 0.51 0.46
Fit 3: Pl and Neutral Absorption at Source, and One Gaussian  

$\Gamma$		 ... $\rm 1.73_{-0.06} ^{+0.06}$ $\rm 1.99_{-0.02} ^{+0.02}$ $\rm 2.04_{-0.03} ^{+0.03}$ $\rm 1.80_{-0.02} ^{+0.02}$

Normf		 ...   $\rm 1.25_{-0.02} ^{+0.01}$ $\rm 1.26_{-0.02} ^{+0.02}$ $\rm 1.06_{-0.01} ^{+0.01}$

$N_{\rm H}$ ( $\times 10^{22}$ ${\rm cm}^{-2}$)		 ... 6.4 -0.9 +0.8 $\rm 6.04_{-0.20} ^{+0.23}$ $\rm 6.28_{-0.24} ^{+0.27}$ $\rm 7.39_{-0.24} ^{+0.25}$

$E_{\rm line1}$		 ... $\rm 8.05_{-0.07} ^{+0.18}$ $\rm 8.12_{-0.03} ^{+0.04}$ $\rm 7.97_{-0.03} ^{+0.03}$ $\rm 8.11_{-0.01} ^{+0.01}$

$\sigma_{\rm line1}$		 ... 0.140 $\rm0.34_{-0.11} ^{+0.13}$ $\rm0.15_{-0.06} ^{+0.07}$ $\rm0.09_{-0.02} ^{+0.02}$
$EW_{\rm line1}$ (keV) ... $\rm0.23_{-0.07} ^{+0.06}$ $\rm0.14_{-0.11} ^{+0.18}$ $\rm0.16_{-0.10} ^{+0.22}$ $\rm0.17_{-0.04} ^{+0.04}$

$\chi ^2$/(d.o.f.)		 ... 146.9/(106) 531.3/(476) 310.8/(288) 198.4/(181)

$P_{{\rm global}}[{\rm Fit~3}]$		 ... $5.3 \times 10^{-5}$ 0.04 0.18 0.35

$\chi^2(1$- $2~{\rm keV})$/(d.o.f.)		 ... ... 98.8/(59) 53.2/(35) 55.29/(52)

$P_{(1-2~{\rm keV})}[{\rm Fit~3}]$		 ... ... $5 \times 10^{-4}$ 0.03 0.4
Fit 4: Pl and Neutral Absorption at Source, and Two Gaussian  

$\Gamma$		 ... $\rm 1.72_{-0.05} ^{+0.06}$ $\rm 1.98_{-0.02} ^{+0.02}$ $\rm 2.03_{-0.03} ^{+0.03}$ $\rm 1.79_{-0.02} ^{+0.02}$

Normf		 ...   $\rm 1.28_{-0.02} ^{+0.02}$ $\rm 1.29_{-0.02} ^{+0.02}$ $\rm 1.08_{-0.01} ^{+0.02}$

$N_{\rm H}$ ( $\times 10^{22}$ ${\rm cm}^{-2}$)		 ... 6.7 -0.8 +0.9 $\rm 6.20_{-0.21} ^{+0.22}$ $\rm 6.49_{-0.25} ^{+0.27}$ $\rm 7.47_{-0.25} ^{+0.24}$

$E_{\rm line1}$ (keV)		 ... $\rm 8.05_{-0.08} ^{+0.10}$ $\rm 8.05_{-0.02} ^{+0.02}$ $\rm 7.93_{-0.03} ^{+0.03}$ $\rm 8.09_{-0.01} ^{+0.01}$
$\sigma_{\rm line1}$ (keV) ... 0.140 $\rm0.08_{-0.03} ^{+0.02}$ $\rm0.09_{-0.04} ^{+0.04}$ $\rm0.06_{-0.01} ^{+0.01}$

$EW_{\rm line1}$ (keV)		 ... $\rm0.24_{-0.07} ^{+0.06}$ $\rm0.24_{-0.07} ^{+0.12}$ $\rm0.30_{-0.10} ^{+0.15}$ $\rm0.31_{-0.10} ^{+0.19}$

$E_{\rm line2}$ (keV)		 ... $\rm 9.79_{-0.19} ^{+0.20}$ $\rm 9.53_{-0.08} ^{+0.10}$ $\rm 9.52_{-0.09} ^{+0.10}$ $\rm 9.72_{-0.04} ^{+0.05}$

$\sigma_{\rm line2}$ (keV)		 ... $\rm0.41_{-0.16} ^{+0.19}$ $\rm0.80_{-0.20} ^{+0.40}$ $\rm0.80_{-0.10} ^{+0.30}$ $\rm0.70_{-0.14} ^{+0.24}$

$EW_{\rm line2}$ (keV)		 ... $\rm0.43_{-0.13} ^{+0.17}$ $\rm0.19_{-0.08} ^{+0.10}$ $\rm0.21_{-0.11} ^{+0.13}$ $\rm0.22_{-0.09} ^{+0.14}$

$\chi ^2$/(d.o.f.)		 ... 106.7/(103) 509.7/(474) 293.2/(286) 178.9/(179)

$P_{{\rm global}}[{\rm Fit~4}]$		 ... 0.41 0.13 0.39 0.52

$\chi^2(1$- $2~{\rm keV})$/(d.o.f.)		 ... ... 75.3/(59) 35.5/(35) 44.8/(52)

$P_{(1-2~{\rm keV})}[{\rm Fit~4}]$		 ... ... 0.08 0.51 0.79
All absorption-line and edge parameters are computed for the rest frame. The error parameters are 90% confidence limits. (a) Hasinger et al. (2002). (b) Chartas et al. (2002). (c) The fits are carried out fitting simultaneously the pn+MOS data. 293 PI bins are from the pn data, and 188 bins are from the MOS data (in the range 0.2-10 keV). (d) Only pn data. (e) Our reprocessed Chandra data, with 187 bins. (f) Power-law normalization, $\times 10^{-4}$ photons keV-1 cm-2 s-1 at 1 keV in the observed frame. Pl$\equiv$ Power-law.

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