FIGURE 2. Microwear texture analyses.
From the following article:
Dental microwear texture analysis shows within-species diet variability in fossil hominins
Robert S. Scott, Peter S. Ungar, Torbjorn S. Bergstrom, Christopher A. Brown, Frederick E. Grine, Mark F. Teaford & Alan Walker
Nature 436, 693-695(4 August 2005)
doi:10.1038/nature03822
a–d, Meshed axonometrics of digital elevation models (left), bivariate plots of relative area versus scale (middle), and rosette plots of normalized relative length at 1.8 
m by orientation (right) for scans on representative specimens of Alouatta palliata (NMNH 543117) (a), Cebus apella (NMNH 518433) (b), Australopithecus africanus (Sts 61) (c), and Paranthropus robustus (SK 16) (d). Steeper best-fit lines for the steepest order of magnitude on the relative area–scale curves evince higher Asfc values, indicating greater complexity (for example, b and d). More clumped rosettes (for example, a and c) have higher values of epLsar, indicating greater anisotropy of the wear fabric.