Abstract
We present observations of 1200 neutral hydrogen spectra measured over a 2°×6° field, centred at RA 10 h 07 m 00 s , Dec. 53°, which is currently the subject of a ROSAT deep field survey. The column densities measured range from 0.4 to 1.3×10 20 cm −2 , and significant changes in velocity structure are seen. The northern part of the field (i.e.> 52°) shows systematically lower column densities than does the southern part
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