The fraction of the covered full annulus set by the inner and outer radii r_in and r_out
Cluster r_in r_out XMM-Newton/pn XMM-Newton/MOS Chandra/ACIS
arcmin arcmin
A1795 1.5 2.7 0.88 1.00 1.00
A2029 1.5 2.5 0.89 1.00 1.00
A2052 1.7 2.5 0.87 0.98 1.00
A2199 2.0 2.9 0.82 0.93 1.00
A262 1.6 2.7 0.79 0.91 1.00
A3112 1.5 2.9 0.83 0.95 1.00
A3571 0.0 2.1 0.88 0.94 1.00
A85 1.5 3.0 0.85 0.86 0.84
Coma 1.0 5.0 0.93 0.97 0.88
HydraA 1.5 2.7 0.78 0.86 1.00
MKW3S 1.5 2.5 0.89 1.00 1.00