Table 3: Best fit spectral parameters for all the sources listed in Table 2 which are likely extra-galactic. The spectra were fit by an absorbed power-law model. P is the probability level for the fit.
Source $N({\rm H})$ Spectral index $\chi^2$ P Notes
  $10^{22}~{\rm cm^{-2}}$ $\gamma$      
4 0.49 $\pm$ 0.17 1.7 $\pm$ 0.3 1.25 0.25 1T fit equivalent (kT=8.2) - no counterpart
5 0.23 $\pm$ 0.14 2.6 $\pm$ 0.7 1.14 0.30 1T fit equivalent (kT=2.2) - no counterpart
8 0.79 $\pm$ 0.55 2.1 $\pm$ 0.8 0.75 0.74 1T fit equivalent (kT=1.9) - no counterpart
9 0.58 $\pm$ 0.31 3.7 $\pm$ 1.3 0.52 0.92 1T fit equivalent (kT=0.9) - no counterpart
10 1.65 $\pm$ 1.02 1.1 $\pm$ 0.5 1.32 0.16 1T fit unacceptable - see text
11 0.33 $\pm$ 0.21 1.6 $\pm$ 0.5 0.94 0.51 1T fit equivalent (kT=6.6) - no counterpart
12 0.14 $\pm$ 0.16 1.2 $\pm$ 0.4 0.72 0.70 1T fit equivalent (kT=44) - radio source [SB86] L1551 3
15 - - - - no fit possible, very hard spectrum - no counterpart
16 1.89 $\pm$ 1.24 1.6 $\pm$ 0.7 0.92 0.55 1T fit unacceptable - radio source [SB86] L1551 2
17 0.30 $\pm$ 0.16 1.0 $\pm$ 0.2 0.86 0.70 1T fit equivalent (kT=64) - no counterpart
21 2.34 $\pm$ 0.67 2.3 $\pm$ 0.5 0.40 0.94 1T fit equivalent (kT=3.3) - no counterpart
24 4.26 $\pm$ 3.07 3.1 $\pm$ 1.8 2.40 0.02 1T fit equivalent (kT=2.3) - no counterpart
27 1.13 $\pm$ 0.54 1.6 $\pm$ 0.5 1.10 0.36 1T fit equivalent (kT=20) - no counterpart


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