If *switch* is set to **-yes**, the calculation becomes axi-symmetrical
(1D or 2D) for the group *index*.
Each specified coordinate becomes a radius and becomes the
length (=vertical) direction. (The z-direction is the axi-symmetric direction).
Specify only non-negative coordinates, i.e. define the computational domain
in the right half-plane.

tochnog 2001-09-02