Extended Data Fig. 7: The correlation between ΓR and α is not a geometric effect due to boulders’ sizes.
From: Fine-regolith production on asteroids controlled by rock porosity
a, PolyCam image of the surface corresponding to spots 609486110:610097198 where α is low probably because the spots are filled by a large, dark boulder. b, PolyCam image of the surface corresponding to spots 609495164:610106090 where α does not correlate with the size of the largest boulder; this is representative of most of the surveyed areas. c, plot of α as function of the percentage of the OTES spot covered by the largest boulder on the surface. The Spearman test reveals that these two quantities have a probability of non-correlation above the critical threshold of 0.05 in 99.99% of 10,000 trials. This indicates that the ΓR-α correlation of Fig. 1 is not the result of geometric effects. The error bars in panel c correspond to 1 standard deviation (Supplementary Table 1; Methods) computed on ~ 670 samples on average. Credit for global mosaic: NASA/Goddard/University of Arizona.
