tree2tf converts ROOT TTrees into TFTables, which can be saved as
        FITS tables or as TFTables in a ROOT file or an ASRO file.


Either all TTrees in a ROOT file or a single ROOT TTree can be read and
converted. The output format depends on the extension of the output filename:

*.fits  :  FITS table
*.root  :  TFTable in a ROOT file
*.asro  :  TFTable in a ASRO file


Program parameters:

  inFile   	input file name. It has to be a ROOT file


  all_data	if set to "yes" all TTrees in the input File are read and 
                converted.
                if set to "no" only one TTree depending on the next parameter
                is read and converted.

  tree_name     This parameter must be defined if all_data is set to no,
                but has no meaning if all_data is set to yes.
  		It defines the name of the TTree that should be converted.


  outFile  	output file name. The extension of the filename defines the 
  		format of the saved data (see above). The file may already 
                exist. The new data will be added to the file. Already existing
                data in the file are not deleted. The file will be created if
                it does not exist already.


Error Messages:
  
  error during reading parameters (-3003)
        This  message  shows  that  the program cannot read its	parameter file  
        tf2tree.par.  Properly the environment variable PFILES is not set. 
        PFILES should define the path  where  this parameter file is stored. 
        During installation  of  the AstroROOT package this parameter file is 
        copied to ${ISDC_ENV}/pfiles.
        See also in the installation guide at point 3 for an example to set 
        this environment variable.