#
# esize_vs_z
#
# get
#   r.m.s. electron beam size vs z 
#

if test $# -ne 2 
then
  echo usage: $0 'direction[x|y]' ELFIN_outputfile 
  exit
fi 


dlen=`egrep 'Length of dispersion section' $2 |awk -F"=" '{print $2}'|awk '{printf "%e", $1}'`

grep '=' $2 | \
egrep 'z = |spread'| egrep 'z = |position' |\
awk -F"=" '
  BEGIN{ 
    und = 0 ; 
    printf("# %16s %16s(%s)\n", "z", "Electron_BeamSize", "'$1'") 
  }
  /z = /  {
             z = $2 ; 
             ok = 1 ;
          } 
  /position '$1'/  { 
          if( ok == 1 )
          {
             if( z == 0 )
             {  
                und = und + 1 
                if( und == 2 ) { z1 = z0 + '${dlen}' }
             }  
             if( und == 2 ){ z = z1 + z }   
             printf "%16.5e %16.5e\n", z, $2 ;
             z0 = z ; 
           }
           ok = 0
       }'