Heat map timing and colours

[Willem Ferguson]

I did some measurements on the heat map after the latest release 
(5.2-1640-gb3a0ab dated Oct 3rd) which I assume is the 4.6 beta release 
and which incorporates Robert's latest patch.

Attached two dives using the Buehlmann algorithm. The time difference 
between events in the the heat map and those in the dive profile looks 
to be more or less constant during a dive. In dive 1 (attached) the 
difference is approx 100 seconds, while in dive 2 (attached) the 
difference is about 65 seconds. However, in both dives the difference is 
close to 35 horizontal pixels.

With respect to the colours used in the heat map, I deduce the following:

Light blue:  Inert gas tissue pressure far below ambient inert gas 
pressure and close to pressure when dive started.
Dark blue:  Some ongassing has occurred but tissue pressures still far 
below ambient pressure.
Purple:       Tissue gas pressure approaches that of the ambient inert 
gas pressure.
Black:         Tissue gas pressure roughly equal to ambient gas pressure.
Grey-green: Tissue gas pressure greater than, but close to ambient pressure.
Bright green: Tissue gas pressure significantly above ambient pressure 
but below Gradient factor limit. Efficient offgassing is taking place in 
the tissue groups in green.
Green-yellow: Tissue gas pressure approximately at limit imposed by 
gradient factor.
Yellow:           Tissue gas pressure exceeds limit imposed by gradient 
factor.
Orange ?      Approaching GF100 gas pressure   ???
Red ?            Exceeding GF100 gas pressure   ???

In the user manual, I would like to but an example of the gas pressure 
graph in the Information box next to the representation of the same 
instant as a vertical slice through the heat map. In order to do that, 
one needs to understand the colours.

Kind regards,
willem

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