rrdtool graph - \
 --start=end-86400 \
 --title=lämpö \
 --imgformat=PNG \
 --width=700 \
 --base=1000 \
 --height=250 \
 --interlaced \
 DEF:a=/var/lib/rrdcollect//temp.rrd:hda:AVERAGE \
 DEF:b=/var/lib/rrdcollect//temp.rrd:sensor1:AVERAGE \
 DEF:c=/var/lib/rrdcollect//temp.rrd:sensor2:AVERAGE \
 DEF:d=/var/lib/rrdcollect//temp.rrd:sensor3:AVERAGE \
 DEF:i=/var/lib/rrdcollect//temp.rrd:hdc:AVERAGE \
 LINE1:a#00FFFF:hda \
 LINE1:b#0000FF:sensor1 \
 LINE1:c#000080:sensor2 \
 LINE1:d#800080:sensor3 \
 LINE1:i#FFA500:hdc AVERAGE

BZZZ BZZ