"Regress inferred zero points on clear-sky exposures of Stripe 82 against seeing as a check on stellar photometry algorithms."
- Zeropoints for many or all photometric expsoures during SV.
- Seeing measures for each exposure.
- Plot inferred zeropoints vs seeing, look for any trend.
- Measurable trend should be fed back for investigation of SExtractor photometric algorithms. May require revision of the full photometric calibration process (incl. star flats?) if stellar photometry algorithm is altered!