Nat. Methods 10, 228–238 (2013); published online 10 February 2013; corrected after print 1 April 2013

In the version of this article initially published, the affiliation listed for Marc Strickert was incorrect in the PDF. In the HTML, a numbering error caused a mismatch of affiliations to authors for members of the FlowCAP and DREAM consortia. The errors have been corrected in the HTML and PDF versions of the article.