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SETTING <i>UBVRI</i> PHOTOMETRIC ZERO-POINTS USING SLOAN DIGITAL SKY SURVEY <i>ugriz</i> MAGNITUDES
We discuss the use of Sloan Digital Sky Survey (SDSS) ugriz point-spread function (PSF) photometry for setting the zero points of UBVRI CCD images. From a comparison with the Landolt (1992, AJ, 104, 340) standards and our own photometry we find that there is a fairly abrupt change in B, …