Table 2: Three abundance patterns examined for the lead feature. The abundances of ²⁰⁷Pb are computed for 3 assumed values of the production ratio $R=^{235}{\rm U}/^{238}{\rm U}$ , the first considered as the most probable, and the other two chosen 30 per cent below and above. All abundances are with respect to 10¹² hydrogen atoms.
²³⁸U $_{{\rm now}}$ $0.0120\pm 0.0035$

²⁰⁶Pb $0.086\pm0.036$

²³²Th $_{{\rm now}}$ $0.105\pm.013$

²⁰⁸Pb $0.099\pm0.035$

R 0.77 0.59 1.00

²⁰⁷Pb $0.075 \pm.03$ $0.058\pm.02$ $0.098\pm.04$

Tot. Pb $0.26\pm0.10$ $0.243\pm0.09$ $0.283\pm.11$

$\log(\epsilon$ (Pb)) $-0.59\pm.2$ $-0.61\pm.2$ $-0.55\pm.2$

**Table 2:** Three abundance patterns examined for the lead feature. The abundances of ²⁰⁷Pb are computed for 3 assumed values of the production ratio $R=^{235}{\rm U}/^{238}{\rm U}$ , the first considered as the most probable, and the other two chosen 30 per cent below and above. All abundances are with respect to 10¹² hydrogen atoms.
²³⁸U $_{{\rm now}}$	$0.0120\pm 0.0035$
²⁰⁶Pb	$0.086\pm0.036$
²³²Th $_{{\rm now}}$	$0.105\pm.013$
²⁰⁸Pb	$0.099\pm0.035$
R	0.77	0.59	1.00
²⁰⁷Pb	$0.075 \pm.03$	$0.058\pm.02$	$0.098\pm.04$
Tot. Pb	$0.26\pm0.10$	$0.243\pm0.09$	$0.283\pm.11$
$\log(\epsilon$ (Pb))	$-0.59\pm.2$	$-0.61\pm.2$	$-0.55\pm.2$

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