diff --git a/tutorial/ouce2013/rrd-by-example/traffic/graph.inc b/tutorial/ouce2013/rrd-by-example/traffic/graph.inc
--- /dev/null
@@ -0,0 +1,19 @@
+<p>
+<RRD::GRAPH lan<RRD::GETVAR start>.png
+ --title="oss.oetiker.ch network traffic"
+ --vertical-label=Bytes/s
+ --start="<RRD::GETVAR start>"
+ --end="<RRD::GETVAR end>"
+ --width=600
+ --height=100
+ DEF:in=lan.rrd:in:AVERAGE
+ CDEF:nin=in,-1,*
+ LINE1.5:nin#00d000
+ AREA:nin#90ff90:Incoming
+ DEF:out=lan.rrd:out:AVERAGE
+ LINE1.5:out#2020ff
+ AREA:out#9090ff:Outgoing
+ LINE0.5:0#000
+ COMMENT:"<RRD::TIME::NOW '%Y-%m-%d %H\:%M'>\j"
+>
+</p>