Nat. Methods 13, 515–520 (2016); published online 25 April 2016; corrected after print 7 February 2018

In the version of this article initially published, an important funding source, the Agence National de Recherche (ANR-10-BINF-0003 BIP:BIP to M.N.), was omitted. The error has been corrected in the HTML and PDF versions of the article.