Table 5: Column densities of H I measured from the IUE spectra, when good data were available.
Stars Column density N(H $_{\rm tot}$)/E(B-V) f
  of H I (cm-2) (atoms cm-2 mag-1)  
HD 250550 $\rm 9.00_{-4.0}^{+5.0}$ $\times$ 1020 (1) $\rm 4.26_{-1.92}^{+2.33}$ $\times$ 1021 $\rm0.04_{-0.03}^{+0.06}$
HD 259431 $\rm 1.60_{-0.6}^{+2.4}$ $\times$ 1021 (1) $\rm 9.51_{-3.49}^{+10.2}$ $\times$ 1021 $\rm0.35_{-0.24}^{+0.37}$
HD 38087 $\rm 1.91_{-0.41}^{+2.09}$ $\times$ 1021 $\rm 8.46_{-1.41}^{+7.9}$ $\times$ 1021 $\rm0.22_{-0.13}^{+0.15}$
HD 76534 $\rm 2.40_{-1.4}^{+1.6}$ $\times$ 1021 $\rm 1.25_{-0.63}^{+0.77}$ $\times$ 1022 $\rm0.27_{-0.16}^{+0.51}$

(1) Bouret et al. (2003).


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