he same well-characterized facilities as the main survey (see 2MASS) and reduced with the same processing software that incorporates multiple levels of quality assurance. As a result, the overall quality of the 2MASS calibration Atlas and working databases (WDBs) are expected to be comparable to the those from the survey.
The Calibration Point Source Working Database (Cal-PSWDB) is not a "Catalog" in the same sense as the highly reliable, uniform All-Sky PSC.
For more details, go to http://www.ipac.caltech.edu/2mass/releases/allsky/doc/seca4_1c.html
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