Filename                               Reason     Bkg         V      RCAM      TCAM   Sigma
20220121.182802.ucomp.637.l1.p3.fts         0    31.3      6.03       0.2       0.2    0.81
20220121.183034.ucomp.637.l1.p3.fts         0    31.4      5.96       0.2       0.2    0.72
20220121.183306.ucomp.637.l1.p3.fts         0    31.4      6.03       0.2       0.2    0.72
20220121.183539.ucomp.637.l1.p3.fts         0    31.5      5.96       0.2       0.2    0.71
20220121.214739.ucomp.637.l1.p3.fts         0    30.9      4.92       0.2       0.2    0.69
20220121.215011.ucomp.637.l1.p3.fts         0    31.0      4.93       0.2       0.2    0.63
20220121.215243.ucomp.637.l1.p3.fts         0    30.9      4.84       0.2       0.2    0.63
20220121.215515.ucomp.637.l1.p3.fts         0    31.0      4.84       0.2       0.2    0.65
20220121.230616.ucomp.637.l1.p3.fts         0    32.2      4.89       0.2       0.2    1.07

GBU bitmask codes
Code    Description
    1   spar guide control loop is below threshold (0.99)
    2   spar guider intensity below threshold (0.9 * 9.256 * exp(-0.05 * secz))
    4   median background is above threshold (45.0)
    8   median background is below threshold (5.0)
   16   spurious Stokes V signal is above threshold (8.0)
   32   the chi-squared of the occulter fit is above threshold (1000.0)
   64   the difference of the image with the median is above threshold (1.8)

* indicates that the threshold values changed on the day