**Table 2:**
	Lowest z with	Highest z with
	$\tau(\mbox{He {\sc ii}}) \gg 1$ with	remnant
	no corresponding H I	QSO flux
HE 2347-4342	2.83	2.87
Q 0302-003	2.88	2.90^a
QSO 1157+3143	2.88	2.92

^a Except the z = 3.05 low opacity feature which is due to the transverse proximity
effect by a QSO close to the line of sight (Jakobsen et al. 2003).

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations
	3 Observational results
	4 Discussion
	5 Summary
	References