8.2.3} Body data

 The geometry must be specified by establishing two tables. The first
 table describes the type, size and location of the bodies used in the
 geometry description. The second table defines the physical regions
 in terms of these bodies.

 Each body TYPE is referred to by a three-letter code.

 There are three kinds of possible body input formats, two fixed and one free.
 Free format, if used, implies necessarily also the use of free format in
 region input (see below).

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