David Barnes, PASA, 14 (1), 117.
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Analysis
Because no HI gas clouds were detected, it is possible to place limits on the contribution of such clouds to the total mass density in each field. Following the analysis of Shostak (1977) and Fisher & Tully (1981), we obtain 
for non-optical gas clouds of mass 
-
. This upper limit is calculated for a 99 per cent confidence limit, whereas many previous surveys use a 95 per cent confidence limit.
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