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MPN counts of SRB (shaded bars) and DIRB (open bars) at 10 cm (A), 123 cm (B), 165 cm (C), and 235 cm (D) from the vent center in June 1996. The error bars denote the 95% confidence interval. The incubation temperature and the percentage of the total counts accounted for by the MPN counts are shown outside and inside the bars, respectively.
