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 Hi, Speaking about backup tables I use a set of COMEX PRO air tables. Their
originality is that 1: They are based on a heavy workload dive. 
2: The set consist of three tables, the first one is white and used for your
first dive or after a 12 Hrs interval. The second one is yellow and use for a
repetitive dive with an interval of 4 to 12 Hrs. The third one is blue, for a
1 to 4H interval.
There is no calculations to do for sucessive dives, just pick up the right
table depending on your surface interval. So the two last tables are extra
conservatives and very usefull if you don't know your saturation level for a
repetitive dive.

Example:  First dive : Depth 42m for 30 min:

     Stops: 9m:5min - 6m:10 min - 3m:25min.

                Second dive, 2Hrs interval ( blue ), 42m for 15min ( max for
table)

     Stops: 12m:3min - 9m:7min - 6m:15min - 3m:30 min.

Max depth for the tables : 60m.   Rate of ascent 12m/min
The last minute of a stop is used to go to the next stop.
If there is no stop required, then do a safety stop at 3m for 3 min.

     Does  anybody have any comments or critics regarding those tables?

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