SDSS_zwarn0width=640,height=400,toolbar=no,scrollbars=yes,resizable=yes 1SKY_PRIMARY \sep sky fiber 2LITTLE_COVERAGE \sep too little wavelength coverage (<18%) 4SMALL_DELTA_CHI2 \sep χ² of best fit is too close to that of second best (<1%) 8NEGATIVE_MODEL \sep synthetic spectrum is negative (only for stars and QSOs) 16MANY_OUTLIERS \sep fraction of points more than 5σ away from best model is too large (>5%) 32Z_FITLIMIT \sep χ² minimum at edge of the redshift fitting range 64 NEGATIVE_EMISSION \sep a QSO line exhibits negative emission (triggered only in QSO spectra if CIV, CIII, MgII, Hβ, or Hα has lineArea+3σ(lineArea)<0) 128UNPLUGGED \sep the fiber was unplugged, so no spectrum obtained 256BAD_TARGET \sep catastrophically bad targeting data (e.g. bad astrometry) 512NODATA \sep No data for this fiber, e.g. because spectrograph was broken during this exposure (ivar=0 for all pixels)