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Table 1.

Required exposures.

Category Number of Count rate (ct s−1)
XMM time (ks)
clusters min med max Clean Required
Observed & R500 < 15′ 68 0.8 2.9 24.0 1850.9 782.9
Observed & R500 > 15′ 3 18.2 23.3 53.1 420.7 0
New & R500 < 15′ 47 0.6 2.9 7.9 0 1029.0

Notes. In each category, the count rates (minimum, median and maximum), the cleaned XMM-Newton PN archived time, and the requested exposure time (with no overheads), are given. None of the three targets with R500 > 15′ require new exposures.

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