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Converting files to SPEX format
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RGS spectral files and response matrices have to be converted to an
appropriate format for use with SPEX. This is done by a piece of software
called trafo. This document shows a typical run of trafo, with the correct
inputs for standard spectral and response files produced by rgsproc and 
rgsrmfgen.

Assume that you have the files spectrum.pha and response.rmf in a directory
on msslhd. Run trafo in this directory:

   > trafo
   Program trafo: transform data to SPEX 2.0 format

    Are your data in OGIP format            : type=1
    Old (Version 1.10 and below) SPEX format: type=2
  
    Enter the type: 1
    Enter the number of spectra you want to transform: 1
    Enter the maximum number of response groups per energy per spectrum: 1000
    Enter filename spectrum to be read: spectrum.pha
    Exposure time (s): 4.02713281E+04
    Will read errors from file
    Areascal: 1.00000000E+00
    Backscal: 1.00000000E+00
    Corrscal: 1.00000000E+00
    Backfile: none
    Corrfile: none
    No RESPFILE keyword found
    No ANCRFILE keyword found
    No background specified in pha-file.
		
    Read nevertheless a background file? (y/n) [no]: n
    Checking data quality and grouping ...
    Ogip files have quality flags. Quality 0 means okay
    Your spectrum has     1204 bins with bad quality
    Shall we ignore bad channels? (y/n) [no]:y
    Determining background subtracted spectra ...
    No response matrix file specified in pha-file.
    Enter filename response matrix to be read: response.rmf
    Reading response matrix ...
    No effective area file specified in pha-file.
			  
    Read nevertheless an effective area file? (y/n) [no]: n
    Determining zero response data  ...
   Channel with zero response:        1
   Channel with zero response:        2
   Channel with zero response:        3
   Channel with zero response:        4
   Channel with zero response:        5
 
 etc.
  
   Channel with zero response:     3395
   Channel with zero response:     3396
   Channel with zero response:     3397
   Channel with zero response:     3398
   Channel with zero response:     3399
   Channel with zero response:     3400
   original number of data channels                               : 3400
   channels after passing mask and omitting zero response channels: 2196
   Rebinning data where necessary ...
   Rebinning response where necessary ...
   old number of response elements: 4551285
   new number of response elements: 4520231
   old number of response groups  : 60679
   new number of response groups  : 60568
   Correcting for effective area ... 
   Determine number of components ...
   Found  164 components
   Enter any shift in bins (0 recommended): 0
   order will be swapped ... 
   Enter filename spectrum to be saved: spectrum.spo
   Enter filename response to be saved: response.res 
   Final number of response elements:  4520231
  >