Explanation
The table below shows the maximum amount of allowable oxygen at various depths.
PPo2 is partial pressure, and shows the work load the diver can expect. 1.4 is a stressfull dive and 1.6 
is a restfull dive. Divers should air on the side of caution. A wrong choice in partial pressure to use can
result in convulsions due to oxygen toxicity. DO NOT USE THESE TABLE IF YOU
ARE NOT A CERTIFIED NITROX DIVER. You should were ever possible base your maximum depth on 1.4.
Depth PPo2 1.4 PPo2 1.5 PPo2 1.6
10 70% 75% 80%
12 64% 68% 73%
14 58% 63% 67%
16 54% 58% 62%
18 50% 54% 57%
20 47% 50% 53%
22 44% 47% 50%
24 41% 44% 47%
26 39% 42% 44%
28 37% 39% 42%
30 35% 38% 40%
32 33% 36% 38%
34 32% 34% 36%
36 30% 33% 35%
38 29% 31% 33%
40 28% 30% 32%
42 27% 29% 31%
44 26% 28% 30%
46 25% 27% 29%
48 24% 26% 28%
50 23% 25% 27%
52 23% 24% 26%
54 22% 23% 25%
56 21% 23% 24%
58 21% 22% 24%
60 20% 21% 23%
62 19% 21% 22%
64 19% 20% 22%
66 18% 20% 21%