diff --git a/serial/essai.sh b/serial/essai.sh
index 31a3189..3a4ff81 100755
--- a/serial/essai.sh
+++ b/serial/essai.sh
@@ -17,7 +17,7 @@ set title	"Dans le Double Dragon 2"
 set xdata 	time
 set timefmt 	"%s"
 set format x 	"%H:%M:%S"
-set yrange [-5.0 : 30.0]
+set yrange [ 5.0 : 30.0]
 plot	"${DATAFILE}" using 1:2 title " foo" with lines, \
 	"${DATAFILE}" using 1:3 title " bar" with lines, \
 	"${DATAFILE}" using 1:4 title "quux" with lines, \