The Electronic Journal of Combinatorics

v15i1n7 — Comment by the authors, Oct 6, 2008.

The acknowledgement included in the paper is incomplete. In addition to all authors thanking the Engineering and Physical Sciences Research Council (EPSRC) for its support (grant EP/D068800/1), K. Huber and J. Koolen would also like to thank the Royal Society for their support within their International Joint Projects scheme.