The datatype chandra contains the information of the associated optical source.
The results have been published in various formats, differing from one cluster to the other. Therefore, columns may remain empty for some clusters.
Please, note that the source number corresponds to the originally published numbering system,
and is not on the adopted cluster numbering system.
|RA||:||Xray source Right Ascension (J2000)|
|Dec||:||Xray source Declination (J2000)|
|Exp||:||Exposure time [ksec]|
|Cnt||:||Count rate [count/ksec]|
|Err||:||Uncertainty on the counts|
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