Table 5: June 1980 Einstein data: Bregman et al. (1980). December 1983 EXOSAT data: Bregman et al. (1990). June 1988-July 1988 GINGA data: Kawai et al. (1991). December 1992 ROSAT data: Urry et al. (1992). November 1995 ASCA data: Sambruna et al. (1999). July 1997 RXTE data: Madejski et al. (1999). November 1997 BeppoSAX data: Padovani et al. (2001). June and December 1999 BeppoSAX data: Ravasio et al. (2002).
Date $\alpha_{1~\rm keV}$ $F_{1~\rm keV}$ $F_{2{-}10~\rm keV}$ $\alpha_{\rm opt}$ FV
    ($\mu$Jy) (10-12 c.g.s.)   (mJy)
June 1980 $2.2\pm1.0$ 1.6 7.1* $2.2\pm0.2$ 5.75
December 1983 (2.2) 0.8   $2.1\pm0.4$ 9.55
June 1988 $0.71\pm0.07$ 1.27 7.7* $2.2\pm0.1$ 4.2
July 1988 $1.16\pm0.24$ 1.35 4.1* $3.21\pm0.02$ 6.46
December 1992 $0.94\pm0.46$ 0.88 3.7*    
November 1995 $0.96\pm0.04$ 2.22 8.9 $0.8\pm0.2$ 5.7
July 1997 $0.59\pm0.03$ 3.55 26 $1.85\pm0.4$ 27.9
November 1997 $0.89\pm0.13$ 2.4 11.2    
June 1999 $1.57\pm0.25$ 0.77 6.5 $1.2\pm0.2$ 26.4
December 1999 $0.63\pm0.06$ 0.96 12.3 $1.8\pm0.3$ 18.6
July 2000 $0.8\pm0.1$ 1.1 5.8 $1.84\pm0.01^a$ 12.08a
  $0.8\pm0.1$ 1.1 5.8 $0.94\pm0.01^b$ 25.60b
October 1.45+0.1-0.5 11.4 21 $1.58\pm0.04^a$ 17.56a
November 2000 1.45+0.1-0.5 11.4 21 $0.64\pm0.02^b$ 37.23b
* From our calculations.  
a Using AB=1.42. b Using AB=2.5: see discussion.  


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