*Eigenvector for node index for the principal unknowns.
First the results for the unknowns for the first eigen mode are given.
Then the results for the unknowns for the second eigen mode are given. Etc.
*

*Only the principal unknowns of these unknowns have been actually
solved in the eigen problem.
*

*See also control_eigen and the principal unknowns listed in
the initialization part.
*

tochnog 2001-09-02