Suunto Vyper User Manual page 76

Tissue group
Whole-Body Toxicity
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Theoretical concept used to model bodily tissues
for the construction of decompression tables or
calculations.
Another form of oxygen toxicity, which is caused by
prolonged exposure to high oxygen partial
pressures. The most common symptoms are
irritation in the lungs, a burning sensation in the
chest, coughing and reduction of the vital capacity.
Also called Pulmonary Oxygen Toxicity. See also
OTU.