Fig. 1
Determination of 
for HD 156292 (O9.7III). The IUE spectrum is in black. In the UV, most features are due to Fe IV
(~ 1775−1840 Å) and Fe III (≳1840 Å). Models are shown in green (
lower limit), red (final model), and blue (
upper limit). In the bottom panels, these models are shown for Teff diagnostics in the optical (He I λ4471, He II λ4542, and He II λ5412).
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