Tue, 16 Aug 2011 10:21:14 +0000 urbanc final(?) version of the paper
Mon, 15 Aug 2011 22:36:26 +0000 urbanc a bit more polishing
Mon, 15 Aug 2011 21:09:08 +0000 urbanc polishing of the closure section and conclusion
Fri, 12 Aug 2011 17:08:58 +0000 urbanc small typo
(0) -100 -30 -10 -4 +4 +10 +30 +100 tip