In addition to the observed trends in particles sizes, the STEM imaging revealed another crucial difference between the isothermal and non-isothermal annealed particles: the particle density was significantly higher in the non-isothermal case, and this can be clearly seen in Figure . We counted particles in several images and constructed their respective particle density histograms (by extrapolating to cm-scale); the results are shown in Figure . The particle densities for the two isothermal anneals (~4 and ~2 x 10 11 cm -2 at 750 and 850 ºC, respectively) are similar to other reports in the literature. But, remarkably, the non-isothermal anneal resulted in a much higher density (~10 12 cm -2 ), over twice the particle density compared to the isothermal anneals, and over a magnitude higher than some reports in the literature for particles formed by film dewetting.