#
#  field power vs z
#

for file in $*
do
  power=`egrep 'distance|(W)' $file  |\
  awk  -F"=" '
  /distance/              { z = $2 ; ok=1 } 
  /field    power/ { if(ok==1){ printf "%.5e %.5e\n", z, $2 }; ok=0 }' |\
  tail -1 | awk '{print $2}'`
  echo $file $power
done