#
# gain_vs_z
#
#  get
#    fractional gain = Power(z)/InputPower -1 vs z 
#

if test $# -lt 1 
then
  echo usage: `basename $0` ELFIN_outputfile
  exit
fi

(
for file in $*
do
  gain=`egrep 'fractional gain' $file | tail -1`
  echo `echo $file|sed s/[a-zA-Z]//g` $gain
done
) | sort -n 
cat gvsp | spline > gvsp.sp
getmax gvsp.sp > gvsp.sp.max