This is the software needed to read df format files.

df_idl_lib.tar.gz is a gzipped tar file that contains all the
                  IDL df procedures and functions.

df_idl_codes.tar.gz is a gzipped tar file that contains
                    definitions of special codes used in df.

dfdoc.dvi.gz is a gzipped dvi file (from TeX) of the df manual
dfdoc.ps.gz is a gzipped PostScript file of the df manual

To install these, decide where you want to put the df stuff.
Say, /usr/local/df/.

First, create some directories:
   mkdir -p /usr/local/df/idl
   mkdir    /usr/local/df/codes

Then, unpack the files:
   gunzip -c df_idl_lib.tar.gz | ( cd /usr/local/df/idl && tar -xovf - )
   gunzip -c df_codes.tar.gz | ( cd /usr/local/df/codes && tar -xovf - )

Finally, permanently configure your environment variables:
   add /usr/local/df/idl to your IDL_PATH
   define METCODES to be "/usr/local/df/codes/"


Note that some of the IDL routines (e.g., nmcr2d.pro) will
require other IDL routines not included here.  You will
find those in our general IDL library, which you
can obtain in ftp://code916.gsfc.nasa.gov/pub/idl/