Filename                               Reason     Bkg         V      RCAM      TCAM   Sigma
20210907.180107.ucomp.1079.l1.p7.fts        0    14.7      1.11       0.0       0.0    0.92
20210907.182939.ucomp.1079.l1.p7.fts        0    14.8      1.11       0.0       0.0    0.79
20210907.211824.ucomp.1079.l1.p7.fts        0    16.8      1.28       0.0       0.0    0.68
20210907.214147.ucomp.1079.l1.p7.fts        0    17.6      1.49       0.0       0.0    0.69
20210907.220512.ucomp.1079.l1.p7.fts        0    19.4      1.48       0.0       0.0    1.20

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 (1.5)

* indicates that the threshold values changed on the day