*This record specifies a quadrilateral in space for which the average of the
unknown values will be calculated. The values are placed
in a record post_quadrilateral_dof with the same index.
Internally in TOCHNOG, post_point records are used to evaluate
the unknowns on the quadrilateral.
In 2D only x_0 y_0 and x_1 y_1 should be specified.
The coordinates are defined in the initial mesh.
See also: post_quadrilateral_n.
*

tochnog 2001-09-02