The expressions to be assigned to the variables of the FE-cross sections are limited by 31 characters.

1. Expressions can be simplified very often. Simplifying shortens also the calculation time.

2. Expression can be split and combined, e. g.:

   Desired assignment: x = table1(sg)+table2(sg)+3.524*table3(sg)

   Solution:

   Definition of an auxiliary formula (-> symbol "f(x)")

   y = 3.524 × table3(sg)

   and assignment

   x = table1(sg)+table2(sg)+y