diff --git a/plot.sh b/plot.sh
index 86b53cc..1770063 100755
--- a/plot.sh
+++ b/plot.sh
@@ -15,7 +15,7 @@ TMPFILE="/dev/shm/tmpdata"
 echo $nbsamp
 wc -l ${DATAFILE}
 
-tail -3000 < ${DATAFILE} > ${TMPFILE}
+tail -${nbsamp} < ${DATAFILE} > ${TMPFILE}
 
 gnuplot << __EOC__
 set term png 	size 1600,800
@@ -27,7 +27,7 @@ set title	"* Temperatures du Phytotron *"
 set xdata 	time
 set timefmt 	"%s"
 set format x 	"%b %d\n%H:%M"
-set yrange [ 0.0 : 30.0 ]
+set yrange [ 0.0 : 40.0 ]
 plot	"${TMPFILE}" using 1:3 title " inside" with lines, \
 	"${TMPFILE}" using 1:4 title "ambient" with lines
 __EOC__