WILD2_CAL
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o Documents must be checked for attribution and amended as needed.

o Add an equation to the end of section III in the navcam_calibration.*
  documents showing calibration constants.  Add a table of these constants
  to the documentation.

o Add the calibration factor used for each image to its PDS label and 
  FITS header.

o Add pixel coordinates for the comet center to the PDS label and FITS 
  header for the navigation/ images.

o If possible, add thumbnail browsers to this dataset.