diff --git a/ircstat/stat b/ircstat/stat
index ed99c8d..686e4af 100755
--- a/ircstat/stat
+++ b/ircstat/stat
@@ -30,15 +30,17 @@ for y in 10 11 12; do
 	done
 done
 
+src="<sed '\$d' _out"
+
 gnuplot -persist <<EOF
 set xtics ($t)
 set grid xtics
 set title "Traffic on the Qi-Hardware IRC channels"
 set xlabel "Month"
 set ylabel "Traffic (kbytes gzip'ed)"
-plot "<sed '\$d' _out" using (\$1/1000) with lines title "#qi-hardware" lw 2, \
-  "<sed '\$d' _out" using (\$2/1000) with lines title "#milkymist" lw 2, \
-  "<sed '\$d' _out" using :((\$1+\$2)/1000) with lines title "Both" lw 2
+plot "$src" using (\$1/1000) with lines title "#qi-hardware" lw 2, \
+  "$src" using (\$2/1000) with lines title "#milkymist" lw 2, \
+  "$src" using :((\$1+\$2)/1000) with lines title "Both" lw 2
 set term png
 set output "out.png"
 replot