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  PAON-4 visibility analysis programs 
       R. Ansari, J.E. Campagne, C. Magneville   -  Feb 2015
                                                    Updated Feb 2017 
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List of files:
- makefile 
- visip4reader.h .cc   a class to read sequentially the visibility files 
  produced by mfac, merge the different frequency bands and set of visibilities 
  and reorder frequencies 
  Updated  July 2016: added the possibility to read the mean FFT coeff matrix computed
	during visibility computation	
- rdvisip4.cc : a simple main program to read visibilitiy files and produce a single 
  mean visibility matrix 
    Updated April 2015: computes also a frequency dependent gain gain(nu) using a gain 
    function developed by Christophe (cmv) for cluster data analysis 
    Updated July 2016: use -m option to read the mean FFT coef matrix

- p4autils.h p4autils.cc : utility classes and functions, in particular argument decoder class
    for different programs 
    
- visi2dtacx.cc : a main program to read visibilitiy files and produce a datatable 
  with auto-correlation and 6 cross correlations (1H-2H 1H-3H 1H-4H 2H-3H 2H-4H 3H-4H) 
  as a function of time for three frequency bins - Can also make a time-frequency map of 
  the 6 cross-correlations. The visibilities are corrected for the electronic gain, using the 
  gain curve g(nu) computed by rdvisip4.cc 

- visi2tmfreq.cc : a main program to read visibilitiy files and produce time-frequency maps 
  for the 8 auto-correlations, corrected for the gain, using the gain curve g(nu) computed by rdvisip4.cc
  Updated Feb 2017 : computes and fills an NTuple with mean/sigma for the 8 auto-correlations signals
  
- msvis2dt.cc (sep 2015) : a program to read meanspecII.ppf (firmware RAW, monitoring output) 
and vismtxII.ppf files ( 4 feeds) to create datatable and time-frequency maps  

- visi2ntac.cc :  DEPRECATED   - replaced by visi2tmfreq
  a simple main program to read visibilitiy files and produce a NTuple 
  with total power as a function of time for the 8 PAON4 auto-correlations 
    Updated April 2015: reads the gain g(nu) file produced by rdvisip4.cc , corrects the 
    auto-correlation signals before integrating in the specified bands