Here are the number of frames, total exposure time, and total sky level
in DN for the frames that went into the version 2 drizzled images.

#  Filter   Nframes   Texp    Sky1     Sky2     Sky3     Sky4
   F300W     77     153700    39.259   78.642   92.954   89.686
   F450W     58     120600    65.055  310.133  319.222  309.483
   F606W    103     109050   238.507 1146.402 1155.758 1131.676
   F814W     58     123600   158.615  768.667  771.862  754.104