Table 5: The extragalactic Log  $(N>S)-{\rm Log}~ S$ maximum likelihood best fit parameters: N(>S) = K $\times $ ( S/10-13) $^{-\alpha }$, where N(>S) is the surface densities of sources having a flux greater than S in deg-2.
Sample Objects $\alpha$ K
       
(1) (2) (3) (4)
BSSa 330 $\rm 1.80^{1.91}_{1.69}$ $\rm 6.1^{5.8}_{6.4}$
HBSS 65 $\rm 1.64^{1.89}_{1.41}$ $\rm 1.5^{1.4}_{1.6}$
HBSS AGN1 41 $\rm 1.72^{2.03}_{1.42}$ $\rm0.92^{0.82}_{1.0}$
HBSS AGN2 21 $\rm 1.57^{1.99}_{1.18}$ $\rm0.50^{0.42}_{0.58}$
Columns are as follows: (1) Sample; (2) Number of sources used in the fit; (3) Best fit power-law slope and 68% confidence intervals; (4) Log  $(N>S)-{\rm Log}~ S$normalization and 68% confidence intervals. Note that the normalization K is not a parameter of the fit but is determined by re-scaling the model to the number of objects in the sample. The normalization K reported here corresponds to the surface densities at $1\times 10^{-13}$ erg cm-2 s$^{-1} \ $. NOTE - a As explained in Sect. 3.1 we have excluded from the fit the 3 BSS extragalactic sources having a flux greater than $1\times 10^{-12}$ erg cm-2 s$^{-1} \ $.

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