For non-Nature subscribers also available as PDF at:
http://pdfmenot.com/store_local/996c794f28d65c93d38d6cb60ff50d2f.pdf
or as Flash-Version:
http://pdfmenot.com/view/http://pdfmenot.com/store_local/996c794f28d65c93d38d6cb60ff50d2f.pdf
From afar the graphics look a bit like that “pinch”, albeit only calculated with a single particle.
