Abstract
We recently discovered that figure 3 in our paper (New J. Phys. 11 055017) contains a small error. The error occurred when we numerically evaluated the quantities plotted in the figure. The analytical expressions of these quantities that appear in the paper are correct. The corrected figure is given here. Figure 3. The vertical line in the figure has been moved from Cdd = 3.23 to Cdd = 2.4.Essentially, the vertical line in the figure has been moved from Cdd = 3.23 to Cdd = 2.4. Accordingly, the last sentence of section 3 should be modified to say 'Our calculation indicates that the critical dipolar strength is about Cdd = 2.4.' This error does not otherwise affect the contents or conclusions of the paper.
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