Table 1: 3σ count rates upper limits.

Sample 0.5–2 keV 2–7 keV 0.8–4 keV 1.5–5.5 keV
10−7 cts/s 10−7 cts/s 10−7 cts/s10−7 cts/s

210 galaxies 3.4 5.8 6.2 6.2
77 galaxies 5.9 9.7 9.6 10.1