This sets, for either the **geometry_line** or the **geometry_triangle**
or the **geometry_quadrilateral** with the same index extra factors
which are used for the **bounda_unknown** and the **bounda_force**
records. The boundary conditions at a node being part of the geometrical
entity are multiplied with the interpolation of the factors.
For a **geometry_line** either 2 or 3 factors should be specified;
2 factors define a linear variation where the factors hold at
the start and end of the line respectively;
3 factors define a parabolic variation
where the factors hold at the start, at the middle and at the end of
the line respectively.
For a **geometry_triangle** 3 factors should be specified
(a linear variation with factors for the first,
second and third corner point respectively).
For a **geometry_quadrilateral** 4 factors should be specified
(a linear variation with factors for the first,
second, third and fourth corner point respectively).
In the example below, node 2 will get temperature and
node 3 will get temperature .

...

number_of_space_dimensions 2

condif_temperature

...

end_initia

node 2 0.2 0

node 3 0.4 0.

...

geometry_line 1 0. 0. 1. 0. 0.01

geometry_bounda_factor 1 1. 4.

bounda_unknown 0 -geometry_line 1 -temp

bounda_time 0 0. 20. 1.e6 20.

...

end_data