Suunto Stinger - Ceiling, Ceiling Zone, Floor and Decompression Range

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CEILING, CEILING ZONE, FLOOR AND DECOMPRESSION
RANGE
When in decompression, it is important that you understand the meaning of ceiling,
floor, and decompression range (Fig. 3.16.):
 The ceiling is the shallowest depth where decompression could be made.
At this depth, or below, you must perform all stops.
 The ceiling zone is the optimum decompression stop zone. It is the zone
between the minimum ceiling and 1.8 m [6 ft] below the minimum ceiling.
 The floor is the deepest depth at which the decompression stop time will
not increase. Decompression will start when you pass this depth during
your ascent.
 The decompression range is the depth range between the ceiling and floor.
Within this range, decompression takes place. However, it is important to
remember that the decompression will be very slow at, or close to, the floor.
The depth of the ceiling and floor will depend on your dive profile. The ceiling depth
will be fairly shallow when you enter the decompression mode, but if you remain at
depth, it will move downward and the ascent time will increase. Likewise, the floor
and ceiling may change upwards while you are decompressing.