Table 3: 90% upper limits on the ACIS-I count rates (CR), 0.5-10 fluxes (F), and 1 keV flux density ($S_{\nu }$) across the NGC 6251 jet regions (following their definition in Birkinshaw & Worrall 1993). The distance d is defined from the inner-outer border of each region to the core. Fluxes are calculated assuming a power-law spectrum, with $\Gamma =2$ and photoelectric absorption column density $N_{\rm H} = 5.7 \times 10^{20}$ cm-2.
Region d Area CR F $S_{\nu }$
  (arcsec) (arcsec2) (10-4) a (nJy)
A 10-40 46.8 2.8 2.3 0.34
B 40-126 140.6 2.2 1.8 0.26
C 126-178 78.1 2.9 2.4 0.36
D 178-264 124.9 1.9 1.6 0.24
$\textstyle \parbox{7cm}{ $^a$\space In the 0.5--10~keV band, in units of $10^{-15}$ ~erg~cm$^{-2}$ ~s$^{-1}$ .}$


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