diff --git a/usrp/sps/row b/usrp/sps/row
index f16517c..bd07876 100755
--- a/usrp/sps/row
+++ b/usrp/sps/row
@@ -35,24 +35,28 @@ for prefix in "$@"; do
 	echo "<TD><A href=\"$prefix.png\"><IMG src=\"$prefix-small.png\"></A>"
 	echo "<TD align="right">-0.5 MHz"
 
+	>_peak
+
 	f=2405
 	while [ $f -le 2480 ]; do
-		./viz -f LiberationSans-Bold -p $prefix-$f.png \
-		  -o $f.fft $prefix $f
+		echo -n "$f " >>_peak
+		./viz -f LiberationSans-Bold -m -p $prefix-$f.png \
+		  -o $f.fft $prefix $f >>_peak
 		convert -resize '15%' $prefix-$f.png $prefix-$f-small.png
 		echo "<TD><A href=\"$prefix-$f.png\"><IMG src=\"$prefix-$f-small.png\"></A>"
 		f=`expr $f + 5`
 	done
 
 	echo "<TR>"
-	echo "<TD>"
+	echo "<TD><A href=\"$prefix-peak.png\"><IMG src=\"$prefix-peak-small.png\"></A>"
 	echo "<TD align="right">+0.5 MHz"
 
 	f=2405
 	while [ $f -le 2480 ]; do
 		f1=`expr $f + 1`
-		./viz -f LiberationSans-Bold -p $prefix-$f1.png \
-		  -o $f1.fft $prefix $f1
+		echo -n "$f1 " >>_peak
+		./viz -f LiberationSans-Bold -m -p $prefix-$f1.png \
+		  -o $f1.fft $prefix $f1 >>_peak
 		convert -resize '15%' $prefix-$f1.png $prefix-$f1-small.png
 		echo "<TD><A href=\"$prefix-$f1.png\"><IMG src=\"$prefix-$f1-small.png\"></A>"
 		f=`expr $f + 5`
@@ -69,8 +73,13 @@ for prefix in "$@"; do
 	./range >_tmp
 	./vizr -f LiberationSans-Bold -p $prefix.png $prefix _tmp
 	rm -f $ffts _tmp
-
 	convert -resize '15%' $prefix.png $prefix-small.png
+
+	sort -n _peak >_tmp
+	./vizp -f LiberationSans-Bold -p $prefix-peak.png $prefix _tmp
+	rm -f _peak _tmp
+	convert -resize '15%' $prefix-peak.png $prefix-peak-small.png
+
 done
 cat <<EOF
 </TABLE>
diff --git a/usrp/sps/vizp b/usrp/sps/vizp
new file mode 100755
index 0000000..67a7b8f
--- /dev/null
+++ b/usrp/sps/vizp
@@ -0,0 +1,52 @@
+#!/bin/sh
+
+usage()
+{
+	echo "usage: $0 [-f font] [-p png_file] prefix peak_file" 1>&2
+	exit 1
+}
+
+
+font=
+term=
+output=
+
+while true; do
+	case "$1" in
+	-f)	[ "$2" ] || usage
+		shift
+		font=$1;;
+	-p)	[ "$2" ] || usage
+		shift
+		term="set term png"
+		output="set output \"$1\"";;
+	-*)	usage;;
+	*)
+		break;;
+	esac
+	shift
+done
+
+[ "$2" ] || usage
+[ "$3" ] && usage
+
+prefix=$1
+file=$2
+
+gnuplot -persist <<EOF
+$term
+$output
+
+set label "$prefix" at graph 0.03, graph 0.93 font "$font,22"
+
+set xrange [2404:2481]
+set yrange [-20:20]
+
+set xlabel "Frequency of test wave (MHz)"
+set ylabel "Peak power (dB)"
+
+set mytics 2
+set grid
+
+plot "$file" using (\$1-0.5):2 with linespoints notitle
+EOF
diff --git a/usrp/sps/vizr b/usrp/sps/vizr
index afe696f..6944231 100755
--- a/usrp/sps/vizr
+++ b/usrp/sps/vizr
@@ -30,7 +30,7 @@ done
 [ "$2" ] || usage
 [ "$3" ] && usage
 
-prefix=$3
+prefix=$1
 file=$2
 
 gnuplot -persist <<EOF