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User manual: replace heatmap comparison graphic

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The new heatmap graphic reflects how the heatmap is now displayed. Also update
text describing graphic.

Signed-off-by: Rick Walsh <rickmwalsh@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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Rick Walsh 2016-11-03 13:17:10 +11:00 committed by Dirk Hohndel
parent 6bee4babd3
commit 3f060c5c28
2 changed files with 13 additions and 4 deletions
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Documentation/user-manual.txt
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@ -2430,10 +2430,19 @@ http://www.tek-dive.com/portal/upload/M-Values.pdf[Understanding M-values by Eri
Since the colours of the heat map are not affected by the gradient factor(s), the heat map is also
applicable when using the VPM-B decompression model.
The image below shows the profiles and heat maps for two dives to about 45m.
The inert gas pressures in the fast tissues
rise much more rapidly, going through the sequence from light blue to light green and orange.
In contrast, the slow tissues accumulate inert gas at a much slower rate.
The image below compares the profiles and heat maps for two planned decompression dives to 60m:
the first using the Bühlmann decompression model, the second using the VPM-B decompression model.
Both profiles have the same total decompression time, but the VPM-B model requires deeper stops early in the acent phase.
In both profiles, the inert gas pressures in the faster tissues rise much more rapidly than the slower tissues during
the descent and bottom phase, with the colors transitioning from light blue through blue and purple to black.
Similarly, the inert gas pressure in the fast tissues reduces more rapidly than the slow tissues at each decompression stop,
with colors transitioning from red, orange and yellow to green and black.
The comparison of the two profiles and heatmaps shows that by including deep stops, the oversaturation gradient in the
faster tissues early in ascent phase is reduced.
However, on-gassing of slower tissues continues during the deep stops, which leads to greater oversaturation gradient
in slower tissues at the end of the dive.
image::images/tissueHeatmap.jpg["Figure: Inert gas tissue pressure heat-map",align="center"]
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