Table 5: Parameters useful to understand $\gamma$ -ray loudness. Columns: (1) source name; (2) beaming factor $\delta$ ; (3) observed flux in the 0.4-10 keV energy band [erg cm^-2 s^-1]; (4) intrinsic luminosity in the 0.4-10 keV energy band [erg s^-1]; (5) Confidence of the EGRET detection (high >95%; low <95%).
Source $\delta$ F L Conf.

(1) (2) (3) (4) (5)

3C 273 6.5-7 $\approx$ 10^-10 $\approx$ 10⁴⁶ high

NGC 6251 3.2-3.8 $\approx$ 10^-12 $\approx$ 10⁴³ low

PKS 0521-365 1.4-3 $\approx$ 10^-11 $\approx$ 10⁴² low

Cen A 1.2-1.6 $\approx$ 10^-10 $\approx$ 10⁴¹ high

**Table 5:** Parameters useful to understand $\gamma$ -ray loudness. Columns: (1) source name; (2) beaming factor $\delta$ ; (3) observed flux in the 0.4-10 keV energy band [erg cm^-2 s^-1]; (4) intrinsic luminosity in the 0.4-10 keV energy band [erg s^-1]; (5) Confidence of the EGRET detection (high >95%; low <95%).
Source	$\delta$	F	L	Conf.
(1)	(2)	(3)	(4)	(5)
3C 273	6.5-7	$\approx$ 10^-10	$\approx$ 10⁴⁶	high
NGC 6251	3.2-3.8	$\approx$ 10^-12	$\approx$ 10⁴³	low
PKS 0521-365	1.4-3	$\approx$ 10^-11	$\approx$ 10⁴²	low
Cen A	1.2-1.6	$\approx$ 10^-10	$\approx$ 10⁴¹	high

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