  Key features
 FEM can use large meshes both to define the geometry of the problem
(up to 100x100 coarse mesh lines) and to compute in a large fine mesh (up to 200000
mesh points).
 Graphical user interface allows the user to generate and modify the
geometry of the problem, display the results and to generate
documentation.
 The programs for the computation of electron optical properties,
each of them equipped with its own interface, provide paraxial
properties and 1st order chromatic and third order geometrical
aberrations.
 Ray tracing programs solve the equation of motion of charged
particles in numerically computed fields. They are general enough to
calculate paths of any charged particle and accurate enough to obtain
aberrations of arbitrary order.
