Image analyses on distributions of dextran clusters: (a) the raw image and (b) processed image from MIBF_S_su40; (c) the raw image and (d) processed image from MIBF_S_su160; and (e) the raw image and (f) processed image from EIBF_S_su40. The images are taken at the end of the experiments. A full-colour version of this figure can be found on the ICE Virtual Library (www.icevirtuallibrary.com)