# measurements of data values in HDI frames
#   MWR 9/11/2018
#
# The "corner" data columns refer to boxes:
#
#   corner1   is 10x10   box in lower-left corner of image
#   corner2   is 10x10   box in lower-right corner of image
#   corner3   is 10x10   box in upper-left corner of image
#   corner4   is 10x10   box in upper-right corner of image
#   center    is 100x100 box in middle            of image
#
#
# image taken 20170421, before summer 2018
#   night-sky target frame, 1-amp readout mode
#   "center" computed from box at (1000, 1000) instead of true center
#       due to bright target object at center
#       sky level 40 counts
#
#   image        exptime    corner1     corner2     corner3     corner4      center
c7864t0105_1.fits  1000    35.7 12.3   39.4  8.0   41.7  8.6   40.9  8.0   42.6 55.7   


# image taken 20180415, before summer 2018
#   night-sky target frame, 1-amp readout mode
#       sky level 62 counts
#
#   image        exptime    corner1     corner2     corner3     corner4      center
c8223t0098_1.fits  1200    51.4 11.5   57.0  8.6   61.2  8.5   58.8  9.0   66.1  9.3  


# image taken 20180421, before summer 2018
#   night-sky U-band target frame, 1-amp readout mode
#       sky level 75 counts
#
#   image        exptime    corner1     corner2     corner3     corner4      center
c8229t0094_1.fits  1200    61.8 15.5   66.3 10.0   72.8  9.2   71.6  8.7   84.7 10.1  


# images taken 20180910, after summer 2018
#   dark frames, 1-amp readout mode
#
#   image        exptime    corner1     corner2     corner3     corner4      center
c8371t0141_1.fits     1    -4.7 10.1   -0.1  4.6    1.7  4.9    1.4  5.3    0.2  5.2  
c8371t0143_1.fits    10    -3.8 10.1    0.5  4.2    1.0  4.8    1.2  5.3   -0.1  5.2  
c8371t0147_1.fits    10    -5.2 10.3   -1.2  5.2    0.8  5.3    0.7  4.7   -0.3  5.1  
c8371t0142_1.fits   100    -5.0 10.1   -0.6  5.1    8.0  5.5    7.7  6.0   -0.1  5.1  
c8371t0144_1.fits   500    -4.5 10.6   -0.3  5.2   40.5 10.2   37.4  9.4   -0.2  5.2  
c8371t0145_1.fits  1000    -4.2 10.2    0.1  5.7   80.3 17.2   77.3 14.8    0.4 12.2  
c8371t0146_1.fits  1500    -3.3 10.0    0.8  5.3  122.4 21.8  114.2 19.2    3.8 92.9