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Figure 9 shows that when grinding depth was less than 3 [micro]m, although there were some micro concavoconvex features and clear grinding traces on the machined surface, the overall surface quality was fairly good, so it can be concluded that the manner of material removal was dominated by the ductile mode at this point.
Shell weakly concavoconvex to almost biplanate, transverse subrectangular with maximum width slightly anterior to the hinge line; anterior commissure rectimarginate.
This configuration is often referred to as either a "saddle joint" or concavoconvex.