Filename                               Reason     Bkg         V      RCAM      TCAM   Sigma
20210929.183035.ucomp.1083.l1.p5.fts        8    -0.5      0.10       0.1       0.0     NaN
20210929.183248.ucomp.1083.l1.p5.fts       16    10.2     17.88       0.0       0.0     NaN
20210929.190127.ucomp.1083.l1.p5.fts        8    -0.6      0.14       0.0       0.0     NaN
20210929.190339.ucomp.1083.l1.p5.fts       16    11.0     17.71       0.0       0.0     NaN
20210929.220506.ucomp.1083.l1.p5.fts        8    -0.6      0.23       0.1       0.1     NaN
20210929.220718.ucomp.1083.l1.p5.fts       16    14.1    141.45       0.1       0.0     NaN

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 (35.0)
    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 (80.0)
   64   the difference of the image with the median is above threshold (3.0)

* indicates that the threshold values changed on the day