| RunQA | Photo | The RunQA table provides information relevant to the average data quality
for the objects in each field . This table may be
joined to the rest of your query to sub-select only fields of the very highest
quality, for instance, with seeing below a certain threshold, if that is
desired. If you want just one number that describes the overall quality of a
field, your best bet is the fieldQall number (0=bad, 1=acceptable, 2=good,
3=excellent). This overall quality determination is based on the
(dereddened) principal colors of all the stars in the field vs. the
Galactic value of this quantity, the PSF quality, the difference between
Aperture and PSF magnitudes for the same stars
in the field, and the seeing.
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