Figure 4.

The influence of ${\mathsf{\alpha }}_s$ on extracted salient structure. (a) s = 0.2; (b) s = 0.5; (c) s = 0.8; (d) extracted salient structure relevant to s = 0.2; (e) extracted salient structure relevant to s = 0.5; and (f) extracted salient structure relevant to s = 0.8.