#
# z vs laser size 
#

if test $# -ne 2 
then
  echo usage: asize axis filename
  exit
fi 

egrep 'distance|1/e width' $2  |\
awk  -F"=" '
/distance/              { z = $2 ; ok=1 } 
/field strength \('$1'\)/ { if(ok==1){ printf "%.5e %.5e\n", z, $2 }; ok=0 }'