Gnuplot

set title "Scrum Burndown - Quimilero Iteration"
set yrange [-5:40]
set xtics (0,1,2,3,4,5,6,7,8,9,10)
set xrange [0:10]
set xlabel "Day of Iteration"
set ylabel "Units Remaining"
plot \
<dataset>
0 33
1 33
2 26 #GS-796, GS-798, GS-799, GS-800
3 23 #GS-803
4 21 #GS-725
5 17 #GS-804
6 12 #GS-756
7 8 #GS-690
8 1 #GS-805 GS-832 and GS-744 off backlog sized at iteration review
</dataset> using 1:2 title "Autobots" with lines lt 4, \
<dataset>
0 24
1 24 #nothing done on day one
2 19 #GS-775, GS-272, GS-727
3 7 #AG-170, GS-714, GS-442, GS-677
4 3 #this is monday..OP-123 is resolved. 
5 -2 #GS-85
8 -2
</dataset> using 1:2 title "Decepticons" with lines lt 14