Table 1. Correlation of local element distribution and mechanical properties in Nereis jaws.

	Cl, wt %	H, GPa	E, GPa
Zn, wt %	0.94	0.40	0.76
Cl, wt %		0.46	0.76
H, GPa			0.73

Shown are Pearson's correlation coefficients for pairs of data sets (72 data points each, with positive correlation significant on a 0.5% level). H, hardness; E, elastic modulus.