Table 1: Source and background observations.
Obj name $N_{\rm H}$ SXR bkg a
  (1022 cm-2) (cts s-1 arcmin-2)
A3558 0.0389 $(301 \pm 10) \times 10^{-6}$
PHL 5200 0.0526 $(111 \pm 8) \times 10^{-6}$
PKS 0312-770 0.0797 $(122 \pm 6) \times 10^{-6}$
a Average X-ray background count rate in the 3/4 keV band, derived
from the ROSAT all-sky survey diffuse background maps.

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