diff --git a/tools/plot-timing.sh b/tools/plot-timing.sh
index 6b59da4..d2c3600 100755
--- a/tools/plot-timing.sh
+++ b/tools/plot-timing.sh
@@ -8,7 +8,14 @@ IMAGE="timing.png"
 echo ; figlet "plot timing" ; echo
 wc WS/mp4.timing | tee -a WS/log
 
-grep "passage" WS/mp4.timing | awk '				\
+if [ $# == 1 ]
+then
+	sequence=$1
+else
+	sequence="escadrille"
+fi
+
+grep $sequence WS/mp4.timing | tail -3600 | awk '				\
 BEGIN	{							\
 	nbrames=360;						\
 	for (foo=0; foo<nbrames; foo++) {			\
@@ -38,19 +45,21 @@ END	{							\
 
 # cat -n $TMPFILE | tail		# ; exit
 
+
+
 gnuplot	<< __EOC__
 	set term png size 1024,768
 	set output "timing.png"
 	set grid
 	set xrange [:360]
 	set yrange [0:]
-	set title "HexaCone : temps de rendu"
+	set title "Séquence '${sequence}'"
 	set xlabel "numéro de la trame"
 	set ylabel "temps en secondes"
-	plot "/dev/shm/plot-timing.tmp" u 1:4 w l t "maximum",	\
-	     "/dev/shm/plot-timing.tmp" u 1:3 w l t "minimum",	\
-	     "/dev/shm/plot-timing.tmp" u 1:2 w l t "moyenne",
+	plot "/dev/shm/plot-timing.tmp" u 1:4 w l lc "#ff0000" t "maximum",	\
+	     "/dev/shm/plot-timing.tmp" u 1:3 w l lc "#0000ff" t "minimum",	\
+	     "/dev/shm/plot-timing.tmp" u 1:2 w l lc "#000000" t "moyenne",
 __EOC__
 
-convert -negate $IMAGE WS/negatif.png
+convert -negate -colorspace gray -level -33% $IMAGE WS/negatif.png