possible O2 PP display bug

[dave remling]

HI,

Great to see a new dive planner.  Just found out abut it via the post in 
Rebreather World.

I note some anomalous spikes in O2 partial pressure that may indicate a 
bug in the extrapolation procedure.

I am running a Predator on a rEvo (computerized.0  Sampling is at 10 
second intervals.  I have looked at the XML dump of the computer log and 
the O2 levels are normal.

The problem seem to ocure when hanging on deco.  I note that a slight 
decrease in depth, followed by slight decrease seems to trigger the 
indicated spike.

for example over a 10 second interval:  starting depth 39.8 feet, O2 
1.09 ending 41.5 feet, O2 1.3

In the middle of this period Subsurface shows an O2 spike to 1.9. As 
there is no dive computer data available for this period I must assume 
it as an artifact of calculation.