Comparison between the IUE and synthetic spectra in the ranges where Ge, Sn, and Pb lines are seen. The modelspectra shown in blue include the estimated abundances of Ge and Sn (from Table 1); the uncertainty range is indicated by a shaded area. The lower bound of the shaded area for the Pb line represents the upper limit for Pb listed in Table 1 plus its uncertainty (i.e., log Pb/H = −6.7). A synthetic spectrum computed without the contribution of Ge, Sn, and Pb is shown as comparison in red. All spectra are smoothed with a three-pixel box filter for clarity.