function limonE100_20060729
     % This is the prototype for processing Field-Mill data taken by li-mon
     %
     % by R. Sonnenfeld 7/11/2005 and 7/30/2006.
     % This script is quite similar to W. Winn's standard script
     % (for example kv2004aug13.m), but I defined a new filetype
     % to reduce confusion.
     % XXXX.flt files are the raw output of limon.  
     % They do not have timestamps
     % at every data point.  These are the inputs to this script.
     % The first thing this script does is reprocess the XXXX.flt files
     % such that every data point has a timestamp.
     % This processed file is saved with the name XXXX.E100.processed
     %
     % Thus if the input file was e20050709_2256.flt, then the output file
     % would be e20050709_2256.E100.processed
     %
     % Winn's comments:
     % Plot E(kiva) from sheep.
     % There are Ng groups starting with 555555 in this data file.
     % A full group has 10 rows with 555555, lat, lon, date, time, etc.,
     %    and 240 rows of data.  A full group has 250 rows.
     % Sample time is 1 second.
     % Each group has 240 seconds of data (4 minutes)
     tmin=-inf; tmax=inf;
     Emin=-inf; Emax=inf;
     print_desired=1; %(1 for printout)
     data_dir='/home/sprite1_backup/DATA/20060726/fieldmill/'; %on feynman
%     data_dir='/home/sprite1_backup/DATA/20050817/SONDE6_CAL/'; %on feynman
     % data_dir='/DATA/20050725/'; %on slug
     filename='hangar_e20060726_1958'; 
%    filename and data_dir are the only strings you need to update when 
%    processing a new data file    
%    Please note that kiva, hangar and annex have special meanings that are
%    used later in this script.
     fn=filename;                          
     A= load(strcat(data_dir,filename,'.flt'));  % A has an incomplete group
     dt = 1.0;                   
     % time between samples: 1.0 sec for kiva, 1.0 for annex 
     if filename(1:4)=='hang'
         dt = 0.1;               ; % time between samples 0.1 for hangar
         end                 
     k  = find(A==555555) ;
     Ng = length(k)       ; % Number of groups.
     Lg = 250             ; % Length of a group. (Is independent of sample rate)
     Nd = Lg - 10         ; % Number of data values in group (240).
     
     % Extract data values:
     B = zeros(Ng*Lg,1)       ; % B has Ng complete groups
     B(1:length(A)) = A       ; % The last group of B has some 0's.
     C = zeros(Lg,Ng)         ; 
     C(:) = B                 ; % Each col. of C is just one group.
     D = C(11:Lg, :)          ; % D has only E values, not date, etc. 240xNg
     E = D(:)                 ; % E is a col. vect.
      
     % Reconstruct a time for each sample: 
     % Initial time for each group, sec from midnight, row vect:
         t0 =  C(8,:)*3600 + C(9,:)*60 + C(10,:) ; % row vect
     % Nd x Ng matrix; each row has initial times for group: 
         t0m = ones(Nd,1)*t0      ; % Nd x Ng,  All rows are the same.
         tr  = 0:dt:((Nd-1)*dt)   ; % row
         tr  = tr'                ; % col. times after start of group.
     % Each col. in following matrix has times after start of group:
         trm = tr*ones(1,Ng)      ; % Nd x Ng 
     % Time, sec. after midnight, in a matrix:
         tm  = t0m + trm          ; % Nd x Ng
     % Time, sec. after midnight in a col vector:
         t   = tm(:)              ; % 
     % Find out if there is a roll over (a new day):
         kroll = find( t < t(1) )      ; % Detect a roll over.
         t(kroll) = t(kroll) + 3600*24 ; % Add # of sec in 24 hours. 

     % Make a flat file with E(t):
     M = [t,E] ;
     save (strcat(filename,'.E100.processed'),'M','-ASCII')
  
     % Overview
     figure(1); clf
%    t is seconds since midnight
     thours=t/3600.0;   %thours is decimal hours since midnight

     plot(thours, E)
     axis([-inf, inf, Emin, Emax])
     grid
     titl=['Balloon Hangar E-field data for ',filename,'.flt'];
     title(titl,'Interpreter','none') %Turn off tex processing ... also 'latex' is valid
     xlabel('Time (NTP), hours since, 00:00UTC')
     ylabel('E, kV/m')
     stampit
if print_desired==1     
    temp=input(['type p to create file ',fn,'.eps\n'],'s');
    %print -djpeg -r300 ES2004_0818_2020-21Ez-double
    if temp=='p'
     %   print( '-djpeg', '-r300', fn )
        print( '-depsc2', '-r300', fn )
    end
    temp=input(['type x to xview file ',fn,'.jpg\n'],'s');
    %print -djpeg -r300 ES2004_0818_2020-21Ez-double
    if temp=='x'
%        system(['xv ',fn,'.jpg &'])
        system(['gv ',fn,'.eps &'])
    end
end