**Table 1:** Atmospheric parameters derived from independent UV spectra.
$\begin{displaymath}\begin{tabular}{cr@{$\;\pm\;$}lr@{$\;\pm\;$}lr@{$\;\pm\;$}l} ... ...UE & 24~000&800 & 7.91&0.43 & 42.3&3.8\\ \hline \end{tabular} \end{displaymath}$

	1 Introduction
	2 Observations with HST
	3 Ultraviolet spectra
	4 Amplitude variation with wavelength
	5 Concluding remarks
	References