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听provides read-out-streak photometry for sources in XMM-SUSS3 which are too bright in a particular band for reliable photometry through the normal direct measurement process, given听flag 11听(2048) in the XMM-SUSS3 catalogue.听
In a number of circumstances, including crowded fields, explicit source confusion and sources which are too bright even for the read-out streak method, the read-out streak photometry is not deemed to be reliable. Therefore the number of photometric measurements in the supplementary catalogue is lower than the number of measurements within XMM-SUSS3 which are flagged as having too high a count rate for standard photometry.听
The read-out-streak photometry method, and the construction of the supplementary catalogue are described in detail in听. The supplementary catalogue table contains a subset of XMM-SUSS3 columns. The first five columns permit each entry to be identified with a unique XMM-SUSS3 source and XMM-Newton OBSID. The remaining 24 columns contain read-out-streak-derived magnitudes and magnitude errors in Vega and AB systems.
The following table contains the following number of magnitude measurements in the corresponding XMM-OM filters:
| Filter | Number of measurements |
| V | 514 |
| B | 666 |
| U | 714 |
| UVW1 | 538 |
| UVM2 | 153 |
| UVW2 | 41 |