Histograms of fiber bundle diameters from scanning electron micrographs of digested clot surfaces. Fiber bundle diameters were measured from micrographs similar to those shown in Fig 2. Fiber bundle diameters are in nanometers. The histograms for each digestion experiment are arranged in the same way as the corresponding representative micrographs in Fig 2, for ease of comparison. The same number of measurements was made for each digestion condition. (A) 0.2 U/mL plasmin, 30 minutes. (B) 0.2 U/mL plasmin, 1 hour. (C) 0.2 U/mL plasmin, 3.5 hours. (D) Control, no plasmin. (E) 0.5 U/mL plasmin, 30 minutes. (F) 2.0 U/mL plasmin, 3.5 hours.