Table 1.

Reproducibility statistics

	$\mathit{\mu }$		${\mathit{\sigma }}_{\mathit{\mu }}$		${\mathit{\sigma }}_{\mathrm{r}}$
	I	O	I	O	I	O
${\mathit{\Theta }}_{\mathrm{h}}$ (${}^{\circ }$)	1.85	3.85	2.32	2.83	0.76	1.37
${\mathit{\kappa }}_1$ (–)	$-25.80$	$-31.04$	7.75	8.44	2.37	6.33
${\mathit{\kappa }}_2$ (–)	$-9.83$	$-9.66$	3.42	4.68	2.56	1.90
d ($\mathrm{\mu }\text{m}$)	487		62		22

$\mathit{\mu }$, overall mean; ${\mathit{\sigma }}_{\mathit{\mu }}$, between-animal standard deviation; ${\mathit{\sigma }}_{\mathrm{r}}$, reproducibility standard deviation. See “Appendix 2” for details on computing these values. ${\mathit{\Theta }}_{\mathrm{h}}$, ${\mathit{\kappa }}_1$, and ${\mathit{\kappa }}_2$ are defined in Fig. 6. d, diameter; I and O, inner and outer layer, respectively