We gratefully acknowledge support from
the Simons Foundation and member institutions.

Format selector for arXiv:0911.4994v2

Set cookies: if your browser supports cookies you can configure your default format.

PDF
Now includes fonts, see our PDF help.

Source
Delivered as a gzipped tar (.tar.gz) file if there are multiple files, otherwise as a PDF file, or a gzipped TeX, DVI, PostScript or HTML (.gz, .dvi.gz, .ps.gz or .html.gz) file depending on submission format. [ Download source ]

For more information consult the viewing help.

Note: Many of the formats above are served gzipped (Content-Encoding: x-gzip). Your browser may silently uncompress after downloading so the files you see saved may appear uncompressed.

Please report any problems to arXiv admins, being certain to state the paper identifier, explicit options you've selected and that you're using arxiv.org.