FLX2XSP (Nov1998)            ftools.heasarc            FLX2XSP (Nov1998)



NAME
    flx2xsp  -- Creates spectra and response files from an ascii file of
    fluxes and errors.
    
    
USAGE
    flx2xsp infile phafil rspfil
    
    
    
DESCRIPTION
    
      FLX2XSP creates OGIP standard PHA  and  RSP  FITS  files  from  an
    ascii  file  containing fluxes and errors. The response file created
    is a unit diagonal matrix of the appropriate size.  This  ftool  can
    be  used  to  convert  any input data into something that can be fit
    using XSPEC (whether this is the correct thing to do is, of  course,
    up to the judgement of the user).
    
    
    
PARAMETERS
    
    infile [character string]
        The  name  of  the ASCII file containing the fluxes and errors.
        Each line should contain at least four numbers. The first two
        give the energy  range  (in  keV)  over  which  the flux is 
        measured. The third number is the flux and the fourth the one  
        sigma error on the  flux.  The  flux  should be in units of 
        photons/cm^2/s. If the file contains multiple spectra then the 
        nspec parameter (see below) should be set and each spectrum 
        should be another two columns in the file ie the second
        spectrum will be the fifth and sixth numbers etc. The file 
        should be ordered in increasing energy and energy ranges
        should be contiguous ie the lower energy for one line should
        be the higher energy of the previous line.
    
    phafil [character string]
         The name of the output spectrum file. If more than one
         spectrum is included in the input ascii file then this will 
         be in the typeII spectral FITS format.
    
    rspfil [character string]
         The name of the output response file
    
    nspec [integer]
         The number of spectra in the input file

    (clobber = no) [boolean]
         If yes then an existing file can be overwritten.
    
    
    
BUGS
    None known
    
    
    
SEE ALSO
     Arnaud etal, 1992. Legacy, 2, 65 (OGIP/92-007)
     The ftools/heasarc tasks GRPPHA, ASCII2PHA
    
    
    
PRIMARY AUTHOR
    
    Keith Arnaud
    HEASARC
    NASA/GSFC
    http://heasarc.gsfc.nasa.gov/cgi-bin/ftoolshelp