Effect of dextran formation mechanism on dextran floc size: (a) areal size distributions of dextran flocs and (b) distributions of dextran flocs in the effective diameter. Inset tables show the statistical parameters for the log-normal distributions: μ is the mean, SD is the standard deviation and Med. is the median value. The effective diameter of each dextran floc was estimated from the floc volume (i.e. occupied area times aperture height) by assuming a spherical shape of a dextran floc. A full-colour version of this figure can be found on the ICE Virtual Library (www.icevirtuallibrary.com)