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ben-wpan/usrp/plpk

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#!/bin/sh
if [ -z "$1" ]; then
echo "usage: $0 file [center]" 1>&2
exit 1
fi
if [ ! -f "$1" ]; then
echo "$1: not found" 1>&2
exit 1
fi
c=${2:--25}
gnuplot -persist <<EOF
set xlabel "MHz"
set ylabel "dB"
set yrange [$c-5:$c+5]
set grid
plot "<sed '\$d' $1" using (\$1):(log(\$3)/log(10)*10) with lines notitle
EOF