Definition of the characteristic flags

Option: (0=show all flags, x=hexadecimal)

1 sky fiber (SKY)
2 too little wavelength coverage (WCOVERAGE<0.18) (LITTLE_COVERAGE)
4 chi-squared of best fit is too close to that of second best (reduced chi-squared <0.01) (SMALL_DELTA_CHI2)
8 synthetic spectrum is negative (only set for stars and QSOs) (NEGATIVE_MODEL)
16 fraction of points more than 5 sigma away from best model is too large (>0.05) (MANY_OUTLIERS)
32 chi-squared minimum at edge of the redshift fitting range (Z_ERR set to -1) (Z_FITLIMIT)
64 a QSO line exhibits negative emission, triggered only in QSO spectra, if C_IV, C_III, Mg_II, H_beta, or H_alpha has LINEAREA+3*LINEAREA_ERR<0 (NEGATIVE_EMISSION)
128 the fiber was unplugged or damaged, and the location of any spectrum is unknown (UNPLUGGED)
256 catastrophically bad targeting data (e.g. bad astrometry) (BAD_TARGET)
512 No data for this fiber, e.g. because spectrograph was broken during this exposure (ivar=0 for all pixels) (NODATA)