We call morpho set any connected component of set of the form
{*x* : *u*(*x*) }, this set being noted in short by
[ *u* ]. Notice that for
= - we get
a lower level set and for
= + an upper level
set. In the case
= the morpho set
will be called iso set.
The structure `Morpho_set` can be used to handle such
morpho set. A `Morpho_set` is given by a list of horizontal segments (See Section 7.4),
where levels and are recorded. Some additional information can
be recorded, such as the neighbor morpho sets.
Please notice that some fields are likely to change in the future.

mw 2004-05-05