...data,

As mentioned in [24], there were a handful of transcription errors in the table published in [10]. The corrected values are: entry 9, coordinates 0106+72; entry 35, coordinates 0459+25; entry 84, ; entry 124, coordinates 1626+27; entry 144, z=0.054; and entry 153, z=0.0244. We are grateful to Borge Nodland for informing us of these corrections.

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...analysis,

There are two procedures described in [24]. In the first, the correlation in the artificial data sets was calculated using the best-fit direction obtained from the real data. As the hypothesis being tested is that there is some direction of anisotropy, not that a specific direction is picked out a priori, it is more appropriate to compare correlations in each set of data (real and artificial) calculated using the best-fit direction for that set. This is equivalent to the second procedure in [24], and is the method followed here.

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