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Because many Chandra targets were observed more than once, these individual source entries correspond to ~94700 unique "master sources".
Each distinct X-ray source identified in the CSC is represented by a single master source entry and one or more individual source entries.
The CSC contains ~136000 individual source entries from ~3900 separate ACIS observations available in the Chandra Public Archive as of Dec. 31, 2008.
The individual source entries record all of the properties about a detection extracted from a single observation, as well as associated file-based data products, which are observation-specific.
The sources of the data are shown under the 'Source ID' entries in the results and metadata tables generated on querying the database.
Annotation from the source entries in these databases is merged and enhanced with additional information from the patent literature and biological context.
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Each distinct X-ray source identified on the sky is represented in the catalog by a single "master source" entry and one or more "source observation" entries, one for each observation in which the source has been detected.
Each identified distinct X-ray source on the sky is represented in the catalog by one or more "source observation" entries - one for each observation in which the source has been detected - and a single "master source" entry.
The Source Observations Table contains source properties based on observational data extracted independently from each Chandra pointing in which the source is detected; it may contain multiple entries corresponding to a single master source entry in the Master Sources Table.
The source significance in the Master Sources Table represents the highest value of the source flux significance among all science energy bands and individual source observations contributing to the merged source entry.
The master source entry records the best estimates of the properties of a source, based on the data extracted from the set of observations in which the source has been detected.
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