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Table 2
Results from the search for a long-term variation in the X-ray data.
| Data set | Best fit slope | Error | FAP | |
| [cts/s/yr] | BS | % | ||
|
|
||||
| ROSAT | ||||
| PSPC | –0.22 | 0.47 | 72 | |
| HRI | 0.05 | 0.05 | 61 | |
| XMM RGS | –0.04 | 0.02 | 63 | |
Notes. The errors and the false-alarm probability (FAP) are obtained from bootstrapping the observed distribution of the measurements (BS).
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