EXPERIMENT 6 (BNU, 4 Dec 2013) No clustering is observed for drosophila
f1 (20:01), f2 (20:10), f3 (20:30)
f4 (21:00), f5 (22:00), f6 (23:00)
f7 (24:00), f8 (1:00), f9 (2:00)
f10 (7:51)