fixit

        Task to change the values of keywords in the global 
        and/or scan headers.
        

 Author
	
        Sanjay Bhatnagar (sanjay@ncra.tifr.res.in)


 in (default=STDIN)

	Name of the input LTA file.


 out (default=STDOUT)

	Name of the output LTA file.


 scans (default=All)

	List of scan numbers the whos headers will be modified as per
        skeys and svals keywords (see below).  The scan headers of all
        other scans will not be modified.


 gkeys (default=DO NOTHING)

	Keyword in the global header which needs change.  A list of
	keywords separated by "," can be supplied.  The number of
	values supplied in the "gvals" below must be >= the number of
	keys specified in "gkeys".


 gvals (default=" ")

	Character string(s) which will form the value of the
	corresponding keywords in the "gkeys" list above.  The number
	of gvals must be >= the number of keywords specified in
	"gkeys". 

	
 skeys (default=DO NOTHING)

	Keyword in the scan header which needs change.  A list of
	keywords separated by "," can be supplied.  The number of
	values supplied in the "gvals" below must be >= the number of
	keys specified in "gkeys".  

        Scan header keywords supplied will get changed to the
	corresponding values for ALL scans.


 svals (default=" ")

	Character string(s) which will form the value of the
	corresponding keywords in the "gkeys" list above.  The number
	of gvals must be >= the number of keywords specified in
	"gkeys". 

        The values for the scan header keywords supplied here apply to
	ALL scans.  No provision to set different values for the same
	keyword in different scan headers yet.