History for RealSurfaceData files:
----------------------------------

2020-10-08. RealSurfaceData2.2
  D. Sawkey. Compress data with zlib.

2018-05-21. RealSurfaceData2.1.1  
  D. Sawkey. Create RealSurfaceData2.1.1 by merging the LBNL LUTs
  from RealSurfaceData2.0 with the Davis LUTs from RealSurfaceData2.1.
