The four figures below show the dive profile and accumulated amount of nitrogen accumulated for a dive.
As the ascent speed specified by the dive table is 10 m per minute, the following profile that allows you to stay at a shallow depth while ascending and enjoy underwater is not considered in making the dive table.
However, since I do not know the amount of nitrogen in the body after the actual dive, I included the time staying at a shallow depth during ascent in the dive time and use the dive table to find out the safest Residual Group.
Of course, on the dive table, the profiles below are considered the same dive, but the actual amount of nitrogen accumulated will be different for each dive.