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Hi Martin,

On 2/7/00 you wrote;
<< ... The 3rd Edition of the NOAA Manual (4th due out this month - but I
don't expect changes) has time/pO2 limit tables for oxygen exposure for working
divers as follows:
SINGLE EXPOSURE Maximums:
   PPO2 ATA     Minutes
      1.6           45
      1.5          120
      1.4          150
      1.3          180
      1.2          210
(i.e., if your underwater time is planned for 125 minutes, the max. you can
breath at any point in the dive is 1.4).... >>

Could you please explain a little more about the parenthetical statement.  How
does this correlate with the concept of an "Oxygen clock?"

Thanks a lot for your help.

Scott

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