What are the differences between releases of the ACS source lists, and between WFPC2 and ACS lists? What are common artifacts to watch out for?
Preliminary ACS source lists were released as part of the Early Data Release (July 2007, designated Version Beta 3, or VB3) and of Data Release 1 (February 2008, designated Version 1.0). All such lists are superseded by the Version 2.0 lists, released as part of Data Release 2 in September 2008. For many ACS images, a new version (V3.0) of the SExtractor source lists has been released to correct the photometric zero point used. A significant fraction of the V2.0 SExtractor source lists used incorrect zero points because of a software problem. In addition, the new lists use the most recent determination of the ACS photometric zero points given at http://www.stsci.edu/hst/acs/analysis/zeropoints. Except for the change in zero point, these lists are otherwise equivalent to the V2.0 lists. No new DAOPhot lists have been released in DR3 for ACS images. WFPC2 source lists have been released for the first time as part of DR3, and are designated Version 3.0. These lists are to be considered pr
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