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Answers and rating deltas for

Why do I keep getting 'undefined' for each item in this JSON array?

Author Votes Δ
hvgotcodes 3 +1.09
Usman 1 -0.37
Michael Mior 1 -0.13
dgvid 1 +0.74
cpjolicoeur 0 -2.80
timDunham 0 -2.62
Last visited: Sep 14, 2014, 5:07:29 AM