Filename                               Reason     Bkg         V      RCAM      TCAM   Sigma
20210821.190009.ucomp.1074.l1.p7.fts        0    17.9      1.82       0.1       0.1    0.69
20210821.191924.ucomp.1074.l1.p7.fts        0    18.3      2.28       0.1       0.1    0.67
20210821.204551.ucomp.1074.l1.p7.fts        0    23.0      1.96       0.1       0.0    0.77
20210821.210738.ucomp.1074.l1.p7.fts        0    24.3      1.87       0.1       0.0    0.76
20210821.212654.ucomp.1074.l1.p7.fts        0    24.3      1.95       0.1       0.1    0.79
20210821.214902.ucomp.1074.l1.p7.fts        0    26.5      2.10       0.1       0.0    0.88

GBU bitmask codes
Code    Description
    1   spar guide control loop is below threshold (0.99)
    2   spar guider intensity below threshold (0.9 * 6.551 * exp(-0.05 * secz))
    4   median background is above threshold (30.0)
    8   median background is below threshold (5.0)
   16   spurious Stokes V signal is above threshold (4.0)
   32   the chi-squared of the occulter fit is above threshold (80.0)
   64   the difference of the image with the median is above threshold (1.5)

* indicates that the threshold values changed on the day