Figure 4

Fractal character of AP treated samples. A) and B) Similar plots as in Fig. 3B), for 'most AP damaged' (bicarbonate powder, d = 7 mm, t = 10 s) and 'least AP damaged' (glycine powder, d = 2 mm, t = 5 s) AP treatment conditions, respectively. Both raw (filled circles) and flattened (void circles) AFM data have been used. Straight thick lines are the linear regression curves for raw (black) and flattened (gray) data, respectively. Δ² numbers represent the residual deviations squared for the fit.