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\section{Data Products}  \begin{itemize}  \item formats  \item naming conventions  \item headers  \item minimal list of fields for products below  \end{itemize}  \begin{enumerate}  \item image products:  \begin{itemize}  \item biases  \item flat fields  per pixel or per area?  any alternative to sky flats? [Robert L.]  [do our CCDs show DES/LSST tree ring structure?]  \item fringe maps? (i-band)  \item processed epochal images  mask images  PSF maps  zp *not* based on mag_auto  \item deep coadds  mask images  weight images  PSF maps  zp *not* based on mag_auto  (multiple stacks? optimally deep, stacks in several seeing bins,   > x months old? [algorithm dependent])  \item subtractions   mask images  PSF maps  \end{itemize}  \item source data:  \begin{itemize}    \item epochal:  source detection on frame [enables astrometric searches]  aperture [no mag_auto]  PSF  forced photometry from deep reference  subtraction candidates + RealBogus score  \item coadd:  source detection  aperture [no mag_auto]  PSF  \item per source:  relative-photometry-corrected lightcurves   (per frame relative photometry, or ubercal)  \end{itemize}  \end{enumerate}