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The DSSI photometric precision is ~0.1 mag in R and ~0.2 mag in I at R~14 (Horch et al., 2012), and the pipeline-processed DSSI data will include photometric zero points if executed under photometric conditions and accompanied by a photometric calibrator. Note that programs wishing to do photometry must include 15 minutes (including acquisition overheads) per night for calibrators.