Table 1: MOS2 count rate to flux conversion factors.
$\alpha _{\rm E}$ HR2 Flux (0.5-4.5 keV) Flux (4.5-7.5 keV)
    10-12 erg cm-2 s$^{-1} \ $ 10-11 erg cm-2 s$^{-1} \ $
(1) (2) (3) (4)
-3.0 0.77 14.3; 14.4; 15.0 4.53; 4.54; 4.59
-2.0 0.56 12.8; 12.9; 13.6 4.24; 4.25; 4.30
-1.0 0.22 10.6; 10.8; 11.7 3.97; 3.97; 4.03
-0.5 0.01 9.47; 9.61; 10.6 3.84; 3.84; 3.90
0.0 -0.22 8.35; 8.49; 9.55 3.71; 3.72; 3.77
0.4 -0.38 7.56; 7.70; 8.82 3.62; 3.62; 3.68
0.5 -0.42 7.38; 7.53; 8.66 3.59; 3.60; 3.65
0.7 -0.49 7.06; 7.20; 8.37 3.55; 3.55; 3.61
0.9 -0.57 6.78; 6.92; 8.11 3.50; 3.51; 3.56
1.0 -0.60 6.65; 6.79; 8.00 3.48; 3.49; 3.54
1.5 -0.74 6.16; 6.31; 7.61 3.38; 3.38; 3.43
2.0 -0.83 5.89; 6.04; 7.46 3.28; 3.28; 3.33
3.0 -0.94 5.75; 5.94; 7.62 3.10; 3.10; 3.15
Columns are as follows: (1) Energy spectral index ( $S_{\rm E} \propto E^{-\alpha _{\rm E}}$); (2) corresponding hardness ratio HR2 computed as discussed in Sect. 3.3; (3) Flux (corrected for Galactic absorption) in the 0.5-4.5 keV energy band corresponding to an observed count rate of 1 cts/s in the same energy band. The three numbers refer to thin, medium and thick filters; (4) Flux (corrected for Galactic absorption) in the 4.5-7.5 keV energy band corresponding to an observed count rate of 1 cts/s in the same energy band. The three numbers refer to thin, medium and thick filters. NOTE - A Galactic absorbing column density of $3\times 10^{20}$ cm-2, the median value for the XMM-Newton fields used here, has been assumed. Given the range of the Galactic absorbing column density along the line of sight (from ${\sim} 5\times 10^{19}$ to 1021 cm-2) the CR2F in the 0.5-4.5 keV energy range are accurate to $\pm $18%; the CR2F in the 4.5-7.5 keV energy range are independent of the Galactic $N_{\rm H}$. Please note that in the case of sources having extreme HR2 values the observed spectra could be much more complex than a simple power law; for these sources the conversion factor reported in the table should be considered only as indicative and a proper X-ray spectral analysis is needed.

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